diff --git a/api/@ohos.buffer.d.ts b/api/@ohos.buffer.d.ts
index e78838f4d50d19ac5ba39ce95ed38652b5313998..5052e2092986a0c1f157fb04036fe7f3b758b45d 100644
--- a/api/@ohos.buffer.d.ts
+++ b/api/@ohos.buffer.d.ts
@@ -40,7 +40,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 11
+ * @since arkts {'1.1':'11', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare namespace buffer {
   /**
@@ -59,13 +60,14 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Enumerates the supported encoding formats.
+   * This parameter specifies the type of a common encoding format.
    *
    * @typedef { 'ascii' | 'utf8' | 'utf-8' | 'utf16le' | 'ucs2' | 'ucs-2' | 'base64' | 'base64url' | 'latin1' | 'binary' | 'hex' }
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   type BufferEncoding =
     | 'ascii'
@@ -103,6 +105,27 @@ declare namespace buffer {
    * @since 11
    */
   interface TypedArray extends Int8Array {}
+  /**
+   * TypedArray  features and methods
+   * 
+   * @typedef { Int8Array | Uint8Array | Uint8ClampedArray | Int16Array | Uint16Array | Int32Array | Uint32Array | Float32Array | Float64Array | BigInt64Array | BigUint64Array }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  type TypedArray = Int8Array
+    | Uint8Array
+    | Uint8ClampedArray
+    | Int16Array
+    | Uint16Array
+    | Int32Array
+    | Uint32Array
+    | Float32Array
+    | Float64Array
+    | BigInt64Array
+    | BigUint64Array;
   /**
    * Allocates a new Buffer for a fixed size bytes. If fill is undefined, the Buffer will be zero-filled.
    *
@@ -133,11 +156,11 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Creates and initializes a Buffer instance of the specified length.
+   * Allocates a new Buffer for a fixed size bytes. If fill is undefined, the Buffer will be zero-filled.
    *
-   * @param { number } size - Size of the Buffer instance to create, in bytes.
-   * @param { string | Buffer | number } [fill] - Value to be filled in the buffer. The default value is 0.
-   * @param { BufferEncoding } [encoding] - Encoding format (valid only when fill is a string). The default value is 'utf8'.
+   * @param { number } size - size size The desired length of the new Buffer
+   * @param { string | Buffer | number } [fill] - fill [fill=0] A value to pre-fill the new Buffer with
+   * @param { BufferEncoding } [encoding] - encoding [encoding='utf8']  If `fill` is a string, this is its encoding
    * @returns { Buffer } Return a new allocated Buffer
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -146,7 +169,8 @@ declare namespace buffer {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function alloc(size: number, fill?: string | Buffer | number, encoding?: BufferEncoding): Buffer;
 
@@ -176,10 +200,9 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Creates a Buffer instance of the specified size from the buffer pool, without initializing it.
-   * You need to use fill() to initialize the Buffer instance created.
+   * Allocates a new Buffer for a fixed size bytes. The Buffer will not be initially filled.
    *
-   * @param { number } size - Size of the Buffer instance to create, in bytes.
+   * @param { number } size - size size The desired length of the new Buffer
    * @returns { Buffer } Return a new allocated Buffer
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -188,7 +211,8 @@ declare namespace buffer {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function allocUninitializedFromPool(size: number): Buffer;
 
@@ -218,9 +242,9 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Creates a Buffer instance of the specified size, without initializing it. 
+   * Allocates a new un-pooled Buffer for a fixed size bytes. The Buffer will not be initially filled.
    *
-   * @param { number } size - Size of the Buffer instance to create, in bytes.
+   * @param { number } size - size size The desired length of the new Buffer
    * @returns { Buffer } Return a new allocated Buffer
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -229,7 +253,8 @@ declare namespace buffer {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function allocUninitialized(size: number): Buffer;
 
@@ -263,10 +288,12 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Obtains the number of bytes of a string based on the encoding format.
+   * Returns the byte length of a string when encoded using `encoding`.
+   * This is not the same as [`String.prototype.length`], which does not account
+   * for the encoding that is used to convert the string into bytes.
    *
-   * @param { string | Buffer | TypedArray | DataView | ArrayBuffer | SharedArrayBuffer } string - Target string.
-   * @param { BufferEncoding } [encoding] - Encoding format of the string. The default value is 'utf8'.
+   * @param { string | Buffer | TypedArray | DataView | ArrayBuffer | SharedArrayBuffer } string - string string A value to calculate the length of
+   * @param { BufferEncoding } [encoding] - encoding [encoding='utf8'] If `string` is a string, this is its encoding
    * @returns { number } The number of bytes contained within `string`
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -281,6 +308,25 @@ declare namespace buffer {
     encoding?: BufferEncoding
   ): number;
 
+  /**
+   * Returns the byte length of a string when encoded using `encoding`.
+   * This is not the same as [`String.prototype.length`], which does not account
+   * for the encoding that is used to convert the string into bytes.
+   *
+   * @param { string | Buffer | TypedArray | DataView | ArrayBuffer } doc - string string A value to calculate the length of
+   * @param { BufferEncoding } [encoding] - encoding [encoding='utf8'] If `string` is a string, this is its encoding
+   * @returns { number } The number of bytes contained within `string`
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  function byteLength(
+    doc: string | Buffer | TypedArray | DataView | ArrayBuffer,
+    encoding?: BufferEncoding
+  ): number;
+
   /**
    * Returns a new `Buffer` which is the result of concatenating all the `Buffer`instances in the `list` together.
    *
@@ -311,10 +357,10 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Concatenates an array of Buffer instances of the specified length into a new instance.
+   * Returns a new `Buffer` which is the result of concatenating all the `Buffer`instances in the `list` together.
    *
-   * @param { Buffer[] | Uint8Array[] } list - Array of instances to concatenate.
-   * @param { number } [totalLength] - Total length of bytes to be copied. The default value is 0.
+   * @param { Buffer[] | Uint8Array[] } list - list list List of `Buffer` or Uint8Array instances to concatenate
+   * @param { number } [totalLength] - totalLength totalLength Total length of the `Buffer` instances in `list` when concatenated
    * @returns { Buffer } Return a new allocated Buffer
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -324,7 +370,8 @@ declare namespace buffer {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function concat(list: Buffer[] | Uint8Array[], totalLength?: number): Buffer;
 
@@ -352,9 +399,9 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Creates a Buffer instance with the specified array.
+   * Allocates a new Buffer using an array of bytes in the range 0 – 255. Array entries outside that range will be truncated to fit into it.
    *
-   * @param { number[] } array - Array to create a Buffer instance.
+   * @param { number[] } array - array array an array of bytes in the range 0 – 255
    * @returns { Buffer } Return a new allocated Buffer
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -362,7 +409,8 @@ declare namespace buffer {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function from(array: number[]): Buffer;
 
@@ -400,11 +448,12 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Creates a Buffer instance of the specified length that shares memory with arrayBuffer.
+   * This creates a view of the ArrayBuffer without copying the underlying memory.
    *
-   * @param { ArrayBuffer | SharedArrayBuffer } arrayBuffer - ArrayBuffer or SharedArrayBuffer instance whose memory is to be shared.
-   * @param { number } [byteOffset] - Byte offset. The default value is 0.
-   * @param { number } [length] - Length of the Buffer instance to create, in bytes. The default value is arrayBuffer.byteLength minus byteOffset.
+   * @param { ArrayBuffer | SharedArrayBuffer } arrayBuffer - arrayBuffer arrayBuffer An ArrayBuffer, 
+   * SharedArrayBuffer, for example the .buffer property of a TypedArray.
+   * @param { number } [byteOffset] - byteOffset [byteOffset = 0] Index of first byte to expose
+   * @param { number } [length] - length [length = arrayBuffer.byteLength - byteOffset] Number of bytes to expose
    * @returns { Buffer } Return a view of the ArrayBuffer
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -418,6 +467,23 @@ declare namespace buffer {
    */
   function from(arrayBuffer: ArrayBuffer | SharedArrayBuffer, byteOffset?: number, length?: number): Buffer;
 
+  /**
+   * This creates a view of the ArrayBuffer without copying the underlying memory.
+   *
+   * @param { ArrayBuffer } arrayBuffer - arrayBuffer arrayBuffer An ArrayBuffer, 
+   * @param { number } [byteOffset] - byteOffset [byteOffset = 0] Index of first byte to expose
+   * @param { number } [length] - length [length = arrayBuffer.byteLength - byteOffset] Number of bytes to expose
+   * @returns { Buffer } Return a view of the ArrayBuffer
+   * @throws { BusinessError } 10200001 - The value of "[byteOffset/length]" is out of range.
+   * It must be >= [left range] and <= [right range]. Received value is: [byteOffset/length]
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  function from(arrayBuffer: ArrayBuffer, byteOffset?: number, length?: number): Buffer;
+
   /**
    * Copies the passed buffer data onto a new Buffer instance.
    *
@@ -442,9 +508,9 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Copies the data of a passed Buffer instance to create a new Buffer instance and returns the new one.
+   * Copies the passed buffer data onto a new Buffer instance.
    *
-   * @param { Buffer | Uint8Array } buffer - Buffer or Uint8Array instance.
+   * @param { Buffer | Uint8Array } buffer - buffer buffer An existing Buffer or Uint8Array from which to copy data
    * @returns { Buffer } Return a new allocated Buffer
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -452,7 +518,8 @@ declare namespace buffer {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function from(buffer: Buffer | Uint8Array): Buffer;
 
@@ -486,11 +553,12 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Creates a Buffer instance based on the specified object.
+   * For the object whose value returned by valueof() function is strictly equal to object
+   * or supports symbol To primitive object, a new buffer instance is created.
    *
-   * @param { Object } object - Object that supports Symbol.toPrimitive or valueOf().
-   * @param { number | string } offsetOrEncoding - Byte offset or encoding format.
-   * @param { number } length - Length of the Buffer instance to create, in bytes.
+   * @param { Object } object - object object An object supporting Symbol.toPrimitive or valueOf()
+   * @param { number | string } offsetOrEncoding - offsetOrEncoding offsetOrEncoding A byte-offset or encoding
+   * @param { number } length - length length A length
    * @returns { Buffer } Return a new allocated Buffer
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -498,7 +566,8 @@ declare namespace buffer {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function from(object: Object, offsetOrEncoding: number | string, length: number): Buffer;
 
@@ -530,10 +599,11 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Creates a Buffer instance based on a string in the given encoding format.
+   * Creates a new Buffer containing string. The encoding parameter identifies the character encoding
+   * to be used when converting string into bytes.
    *
-   * @param { String } string - String.
-   * @param { BufferEncoding } [encoding] - Encoding format of the string. The default value is 'utf8'.
+   * @param { String } string - string string  A string to encode
+   * @param { BufferEncoding } [encoding] - encoding [encoding='utf8'] The encoding of string
    * @returns { Buffer } Return a new Buffer containing string
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -541,7 +611,8 @@ declare namespace buffer {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function from(string: String, encoding?: BufferEncoding): Buffer;
 
@@ -563,14 +634,15 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Checks whether the specified object is a Buffer instance.
+   * Returns true if obj is a Buffer, false otherwise
    *
-   * @param { Object } obj - Object to check.
+   * @param { Object } obj - obj obj Objects to be judged
    * @returns { boolean } true or false
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function isBuffer(obj: Object): boolean;
 
@@ -592,14 +664,15 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Checks whether the encoding format is supported.
+   * Returns true if encoding is the name of a supported character encoding, or false otherwise.
    *
-   * @param { string } encoding - Encoding format.
+   * @param { string } encoding - encoding encoding A character encoding name to check
    * @returns { boolean } true or false
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function isEncoding(encoding: string): boolean;
 
@@ -633,10 +706,10 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Compares two Buffer instances. This API is used for sorting Buffer instances.
+   * Compares buf1 to buf2
    *
-   * @param { Buffer | Uint8Array } buf1 - Buffer instance to compare.
-   * @param { Buffer | Uint8Array } buf2 - Buffer instance to compare.
+   * @param { Buffer | Uint8Array } buf1 - buf1 buf1 A Buffer or Uint8Array instance.
+   * @param { Buffer | Uint8Array } buf2 - buf2 buf2 A Buffer or Uint8Array instance.
    * @returns { -1 | 0 | 1 } 0 is returned if target is the same as buf
    *         1 is returned if target should come before buf when sorted.
    *        -1 is returned if target should come after buf when sorted.
@@ -650,6 +723,22 @@ declare namespace buffer {
    */
   function compare(buf1: Buffer | Uint8Array, buf2: Buffer | Uint8Array): -1 | 0 | 1;
 
+  /**
+   * Compares buf1 to buf2
+   *
+   * @param { Buffer | Uint8Array } buf1 - buf1 buf1 A Buffer or Uint8Array instance.
+   * @param { Buffer | Uint8Array } buf2 - buf2 buf2 A Buffer or Uint8Array instance.
+   * @returns { number } 0 is returned if target is the same as buf
+   *         1 is returned if target should come before buf when sorted.
+   *        -1 is returned if target should come after buf when sorted.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  function compare(buf1: Buffer | Uint8Array, buf2: Buffer | Uint8Array): number;
+
   /**
    * Re-encodes the given Buffer or Uint8Array instance from one character encoding to another.
    *
@@ -678,11 +767,11 @@ declare namespace buffer {
    * @since 10
    */
   /**
-   * Transcodes the given Buffer or Uint8Array object from one encoding format to another.
+   * Re-encodes the given Buffer or Uint8Array instance from one character encoding to another.
    *
-   * @param { Buffer | Uint8Array } source - Instance to encode.
-   * @param { string } fromEnc - Current encoding format
-   * @param { string } toEnc - Target encoding format.
+   * @param { Buffer | Uint8Array } source - source source A Buffer or Uint8Array instance.
+   * @param { string } fromEnc - fromEnc fromEnc The current encoding
+   * @param { string } toEnc - toEnc toEnc To target encoding
    * @returns { Buffer } Returns a new Buffer instance
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -690,7 +779,8 @@ declare namespace buffer {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function transcode(source: Buffer | Uint8Array, fromEnc: string, toEnc: string): Buffer;
 
@@ -714,7 +804,8 @@ declare namespace buffer {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   class Buffer {
     /**
@@ -746,6 +837,18 @@ declare namespace buffer {
      */
     length: number;
 
+    /**
+     * Gets the element number of the buffer.
+     *
+     * @type { number }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get length(): number;
+
     /**
      * The underlying ArrayBuffer object based on which this Buffer object is created.
      *
@@ -775,6 +878,19 @@ declare namespace buffer {
      */
     buffer: ArrayBuffer;
 
+    /**
+     * The underlying ArrayBuffer object based on which this Buffer object is created.
+     *
+     * @type { ArrayBuffer }
+     * @throws { BusinessError } 10200013 - Buffer cannot be set for the buffer that has only a getter.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get buffer(): ArrayBuffer;
+
     /**
      * The byteOffset of the Buffers underlying ArrayBuffer object
      *
@@ -804,6 +920,19 @@ declare namespace buffer {
      */
     byteOffset: number;
 
+    /**
+     * The byteOffset of the Buffers underlying ArrayBuffer object
+     *
+     * @type { number }
+     * @throws { BusinessError } 10200013 - ByteOffset  cannot be set for the buffer that has only a getter.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get byteOffset(): number;
+
     /**
      * Fills buf with the specified value. If the offset and end are not given, the entire buf will be filled.
      *
@@ -836,12 +965,12 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Fills this Buffer instance at the specified position. By default, data is filled cyclically.
+     * Fills buf with the specified value. If the offset and end are not given, the entire buf will be filled.
      *
-     * @param { string | Buffer | Uint8Array | number } value - Value to fill.
-     * @param { number } [offset] - Offset to the start position in this Buffer instance where data is filled. The default value is 0.
-     * @param { number } [end] - Offset to the end position in this Buffer instance (not inclusive). The default value is the length of this Buffer instance.
-     * @param { BufferEncoding } [encoding] - Encoding format (valid only when value is a string). The default value is 'utf8'.
+     * @param { string | Buffer | Uint8Array | number } value - value value The value with which to fill buf
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to fill buf
+     * @param { number } [end] - end [end = buf.length] Where to stop filling buf (not inclusive)
+     * @param { BufferEncoding } [encoding] - encoding [encoding='utf8'] The encoding for value if value is a string
      * @returns { Buffer } A reference to buf
      * @throws { BusinessError } 10200001 - The value of "[offset/end]" is out of range. It must be >= 0 and <= [right range]. Received value is: [offset/end]
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
@@ -850,7 +979,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     fill(
       value: string | Buffer | Uint8Array | number,
@@ -901,15 +1031,14 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Compares this Buffer instance with another instance.
+     * Compares buf with target and returns a number indicating whether buf comes before, after,
+     * or is the same as target in sort order. Comparison is based on the actual sequence of bytes in each Buffer.
      *
-     * @param { Buffer | Uint8Array } target - Target Buffer instance to compare.
-     * @param { number } [targetStart] - Offset to the start of the data to compare in the target Buffer instance. The default value is 0.
-     * @param { number } [targetEnd] - Offset to the end of the data to compare in the target Buffer instance (not inclusive).
-     * The default value is the length of the target Buffer instance.
-     * @param { number } [sourceStart] - Offset to the start of the data to compare in this Buffer instance. The default value is 0.
-     * @param { number } [sourceEnd] - Offset to the end of the data to compare in this Buffer instance (not inclusive).
-     * The default value is the length of this Buffer instance.
+     * @param { Buffer | Uint8Array } target - target target A Buffer or Uint8Array with which to compare buf
+     * @param { number } [targetStart] - targetStart [targetStart = 0] The offset within target at which to begin comparison
+     * @param { number } [targetEnd] - targetEnd [targetEnd = target.length] The offset within target at which to end comparison (not inclusive)
+     * @param { number } [sourceStart] - sourceStart [sourceStart = 0] The offset within buf at which to begin comparison
+     * @param { number } [sourceEnd] - sourceEnd [sourceEnd = buf.length] The offset within buf at which to end comparison (not inclusive)
      * @returns { -1 | 0 | 1 } 0 is returned if target is the same as buf
      *         1 is returned if target should come before buf when sorted.
      *        -1 is returned if target should come after buf when sorted.
@@ -931,6 +1060,35 @@ declare namespace buffer {
       sourceEnd?: number
     ): -1 | 0 | 1;
 
+    /**
+     * Compares buf with target and returns a number indicating whether buf comes before, after,
+     * or is the same as target in sort order. Comparison is based on the actual sequence of bytes in each Buffer.
+     *
+     * @param { Buffer | Uint8Array } target - target target A Buffer or Uint8Array with which to compare buf
+     * @param { number } [targetStart] - targetStart [targetStart = 0] The offset within target at which to begin comparison
+     * @param { number } [targetEnd] - targetEnd [targetEnd = target.length] The offset within target at which to end comparison (not inclusive)
+     * @param { number } [sourceStart] - sourceStart [sourceStart = 0] The offset within buf at which to begin comparison
+     * @param { number } [sourceEnd] - sourceEnd [sourceEnd = buf.length] The offset within buf at which to end comparison (not inclusive)
+     * @returns { number } number is returned if target is the same as buf
+     * @throws { BusinessError } 401 - Parameter error. Possible causes:
+     * 1.Mandatory parameters are left unspecified;
+     * 2.Incorrect parameter types.
+     * @throws { BusinessError } 10200001 - The value of "[targetStart/targetEnd/sourceStart/sourceEnd]" is out of range.
+     *         It must be >= 0 and <= [right range]. Received value is: [targetStart/targetEnd/sourceStart/sourceEnd]
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    compare(
+      target: Buffer | Uint8Array,
+      targetStart?: number,
+      targetEnd?: number,
+      sourceStart?: number,
+      sourceEnd?: number
+    ): number;
+
     /**
      * Copies data from a region of buf to a region in target, even if the target memory region overlaps with buf.
      * If sourceEnd is greater than the length of the target, the length of the target shall prevail, and the extra part will not be overwritten.
@@ -967,13 +1125,13 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Copies data at the specified position in this Buffer instance to the specified position in another Buffer instance.
+     * Copies data from a region of buf to a region in target, even if the target memory region overlaps with buf.
+     * If sourceEnd is greater than the length of the target, the length of the target shall prevail, and the extra part will not be overwritten.
      *
-     * @param { Buffer | Uint8Array } target - Instance to which data is copied.
-     * @param { number } [targetStart] - Offset to the start position in the target instance where data is copied. The default value is 0.
-     * @param { number } [sourceStart] - Offset to the start position in this Buffer instance where data is copied. The default value is 0.
-     * @param { number } [sourceEnd] - Offset to the end position in this Buffer instance (not inclusive).
-     * The default value is the length of this Buffer instance.
+     * @param { Buffer | Uint8Array } target - target target A Buffer or Uint8Array to copy into
+     * @param { number } [targetStart] - targetStart [targetStart = 0] The offset within target at which to begin writing
+     * @param { number } [sourceStart] - sourceStart [sourceStart = 0] The offset within buf from which to begin copying
+     * @param { number } [sourceEnd] - sourceEnd [sourceEnd = buf.length] The offset within buf at which to stop copying (not inclusive)
      * @returns { number } The number of bytes copied
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -983,7 +1141,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     copy(target: Buffer | Uint8Array, targetStart?: number, sourceStart?: number, sourceEnd?: number): number;
 
@@ -1007,15 +1166,16 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Checks whether this Buffer instance is the same as another Buffer instance.
+     * Returns true if both buf and otherBuffer have exactly the same bytes, false otherwise
      *
-     * @param { Uint8Array | Buffer } otherBuffer - Buffer instance to compare.
+     * @param { Uint8Array | Buffer } otherBuffer - otherBuffer otherBuffer A Buffer or Uint8Array with which to compare buf
      * @returns { boolean } true or false
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Mandatory parameters are left unspecified; 2.Incorrect parameter types.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     equals(otherBuffer: Uint8Array | Buffer): boolean;
 
@@ -1047,13 +1207,11 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Checks whether this Buffer instance contains the specified value.
+     * Returns true if value was found in buf, false otherwise
      *
-     * @param { string | number | Buffer | Uint8Array } value - Value to match.
-     * @param { number } [byteOffset] - Number of bytes to skip before starting to check data.
-     * Number of bytes to skip before starting to check data. If the offset is a negative number,
-     * data is checked from the end of the Buffer instance. The default value is 0.
-     * @param { BufferEncoding } [encoding] - Encoding format (valid only when value is a string). The default value is 'utf8'.
+     * @param { string | number | Buffer | Uint8Array } value - value value What to search for
+     * @param { number } [byteOffset] - byteOffset [byteOffset = 0] Where to begin searching in buf. If negative, then offset is calculated from the end of buf
+     * @param { BufferEncoding } [encoding] - encoding [encoding='utf8'] If value is a string, this is its encoding
      * @returns { boolean } true or false
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -1061,7 +1219,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     includes(value: string | number | Buffer | Uint8Array, byteOffset?: number, encoding?: BufferEncoding): boolean;
 
@@ -1095,12 +1254,12 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Obtains the index of the first occurrence of the specified value in this Buffer instance.
+     * The index of the first occurrence of value in buf
      *
-     * @param { string | number | Buffer | Uint8Array } value - Value to match.
-     * @param { number } [byteOffset] - Number of bytes to skip before starting to check data.
-     * If the offset is a negative number, data is checked from the end of the Buffer instance. The default value is 0.
-     * @param { BufferEncoding } [encoding] - Encoding format (valid only when value is a string). The default value is 'utf8'.
+     * @param { string | number | Buffer | Uint8Array } value - value value What to search for
+     * @param { number } [byteOffset] - byteOffset [byteOffset = 0] Where to begin searching in buf
+     * @param { BufferEncoding } [encoding] - encoding [encoding='utf8'] If value is a string,
+     * this is the encoding used to determine the binary representation of the string that will be searched for in buf
      * @returns { number } The index of the first occurrence of value in buf, or -1 if buf does not contain value
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -1108,7 +1267,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     indexOf(value: string | number | Buffer | Uint8Array, byteOffset?: number, encoding?: BufferEncoding): number;
 
@@ -1128,13 +1288,14 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Creates and returns an iterator that contains the keys of this Buffer instance.
+     * Creates and returns an iterator of buf keys (indices).
      *
      * @returns { IterableIterator<number> }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     keys(): IterableIterator<number>;
 
@@ -1154,13 +1315,14 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Creates and returns an iterator that contains the values of this Buffer instance.
+     * Creates and returns an iterator for buf values (bytes).
      *
      * @returns { IterableIterator<number> }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     values(): IterableIterator<number>;
 
@@ -1180,13 +1342,14 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Creates and returns an iterator that contains key-value pairs of this Buffer instance.
+     * Creates and returns an iterator of [index, byte] pairs from the contents of buf.
      *
      * @returns { IterableIterator<[number, number]> }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     entries(): IterableIterator<[number, number]>;
 
@@ -1220,13 +1383,12 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Obtains the index of the last occurrence of the specified value in this Buffer instance.
+     * The index of the last occurrence of value in buf
      *
-     * @param { string | number | Buffer | Uint8Array } value - Value to match.
-     * @param { number } [byteOffset] - Number of bytes to skip before starting to check data.
-     * If the offset is a negative number, data is checked from the end of the Buffer instance.
-     * The default value is the length of this Buffer instance.
-     * @param { BufferEncoding } [encoding] - Encoding format (valid only when value is a string). The default value is 'utf8'.
+     * @param { string | number | Buffer | Uint8Array } value - value value What to search for
+     * @param { number } [byteOffset] - byteOffset [byteOffset = 0] Where to begin searching in buf
+     * @param { BufferEncoding } [encoding] - encoding [encoding='utf8'] If value is a string,
+     * this is the encoding used to determine the binary representation of the string that will be searched for in buf
      * @returns { number } The index of the last occurrence of value in buf, or -1 if buf does not contain value
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -1234,7 +1396,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     lastIndexOf(value: string | number | Buffer | Uint8Array, byteOffset?: number, encoding?: BufferEncoding): number;
 
@@ -1260,16 +1423,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 64-bit, big-endian, signed big integer from this Buffer instance at the specified offset.
+     * Reads a signed, big-endian 64-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 8].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 8
      * @returns { bigint } Return a signed, big-endian 64-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 8. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readBigInt64BE(offset?: number): bigint;
 
@@ -1295,16 +1459,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 64-bit, little-endian, signed big integer from this Buffer instance at the specified offset.
+     * Reads a signed, little-endian 64-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 8].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 8
      * @returns { bigint } Return a signed, little-endian 64-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 8. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readBigInt64LE(offset?: number): bigint;
 
@@ -1330,16 +1495,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 64-bit, big-endian, unsigned big integer from this Buffer instance at the specified offset.
+     * Reads a unsigned, big-endian 64-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 8].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 8
      * @returns { bigint } Return a unsigned, big-endian 64-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 8. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readBigUInt64BE(offset?: number): bigint;
 
@@ -1365,16 +1531,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 64-bit, little-endian, unsigned big integer from this Buffer instance at the specified offset.
+     * Reads a unsigned, little-endian 64-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 8].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 8
      * @returns { bigint } Return a unsigned, little-endian 64-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 8. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readBigUInt64LE(offset?: number): bigint;
 
@@ -1400,16 +1567,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 64-bit, big-endian, double-precision floating-point number from this Buffer instance at the specified offset.
+     * Reads a 64-bit, big-endian double from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 8].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 8
      * @returns { number } Return a 64-bit, big-endian double
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 8. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readDoubleBE(offset?: number): number;
 
@@ -1435,16 +1603,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 64-bit, little-endian, double-precision floating-point number from this Buffer instance at the specified offset.
+     * Reads a 64-bit, little-endian double from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 8].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 8
      * @returns { number } Return a 64-bit, little-endian double
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 8. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readDoubleLE(offset?: number): number;
 
@@ -1470,16 +1639,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 32-bit, big-endian, single-precision floating-point number from this Buffer instance at the specified offset.
+     * Reads a 32-bit, big-endian float from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 4].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 4
      * @returns { number } Return a 32-bit, big-endian float
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 4. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readFloatBE(offset?: number): number;
 
@@ -1505,16 +1675,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 32-bit, little-endian, single-precision floating-point number from this Buffer instance at the specified offset.
+     * Reads a 32-bit, little-endian float from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 4].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 4
      * @returns { number } Return a 32-bit, little-endian float
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 4. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readFloatLE(offset?: number): number;
 
@@ -1540,16 +1711,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads an 8-bit signed integer from this Buffer instance at the specified offset.
+     * Reads a signed 8-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 1].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 1
      * @returns { number } Return a signed 8-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 1. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readInt8(offset?: number): number;
 
@@ -1575,16 +1747,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 16-bit, big-endian, signed integer from this Buffer instance at the specified offset.
+     * Reads a signed, big-endian 16-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 2].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 2
      * @returns { number } Return a signed, big-endian 16-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 2. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readInt16BE(offset?: number): number;
 
@@ -1610,16 +1783,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 16-bit, little-endian, signed integer from this Buffer instance at the specified offset.
+     * Reads a signed, little-endian 16-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 2].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 2
      * @returns { number } Return a signed, little-endian 16-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 2. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readInt16LE(offset?: number): number;
 
@@ -1645,16 +1819,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 32-bit, big-endian, signed integer from this Buffer instance at the specified offset.
+     * Reads a signed, big-endian 32-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 4].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 4
      * @returns { number } Return a signed, big-endian 32-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 4. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readInt32BE(offset?: number): number;
 
@@ -1680,16 +1855,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 32-bit, little-endian, signed integer from this Buffer instance at the specified offset.
+     * Reads a signed, little-endian 32-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 4].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 4
      * @returns { number } Return a signed, little-endian 32-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 4. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readInt32LE(offset?: number): number;
 
@@ -1723,11 +1899,11 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads the specified number of bytes from this Buffer instance at the specified offset, and interprets the result as a big-endian,
-     * two's complement signed value that supports up to 48 bits of precision.
+     * Reads byteLength number of bytes from buf at the specified offset and interprets the result as a big-endian,
+     * two's complement signed value supporting up to 48 bits of accuracy
      *
-     * @param { number } offset - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - byteLength].
-     * @param { number } byteLength - Number of bytes to read. The value range is [1, 6].
+     * @param { number } offset - offset offset Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - byteLength
+     * @param { number } byteLength - byteLength byteLength Number of bytes to read. Must satisfy 0 < byteLength <= 6
      * @returns { number }
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -1736,7 +1912,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readIntBE(offset: number, byteLength: number): number;
 
@@ -1770,11 +1947,11 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads the specified number of bytes from this Buffer instance at the specified offset and interprets the result as a little-endian,
-     * two's complement signed value that supports up to 48 bits of precision.
+     * Reads byteLength number of bytes from buf at the specified offset and interprets the result as a little-endian,
+     * two's complement signed value supporting up to 48 bits of accuracy.
      *
-     * @param { number } offset - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - byteLength].
-     * @param { number } byteLength - Number of bytes to read. The value range is [1, 6].
+     * @param { number } offset - offset offset Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - byteLength
+     * @param { number } byteLength - byteLength byteLength Number of bytes to read. Must satisfy 0 < byteLength <= 6
      * @returns { number }
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -1783,7 +1960,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readIntLE(offset: number, byteLength: number): number;
 
@@ -1809,16 +1987,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads an 8-bit unsigned integer from this Buffer instance at the specified offset.
+     * Reads an unsigned 8-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 1].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy 0 <= offset <= buf.length - 1
      * @returns { number } Reads an unsigned 8-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 1. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readUInt8(offset?: number): number;
 
@@ -1844,16 +2023,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 16-bit, big-endian, unsigned integer from this Buffer instance at the specified offset.
+     * Reads an unsigned, big-endian 16-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 2].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy 0 <= offset <= buf.length - 2
      * @returns { number } Reads an unsigned, big-endian 16-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 2. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readUInt16BE(offset?: number): number;
 
@@ -1879,16 +2059,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 16-bit, little-endian, unsigned integer from this Buffer instance at the specified offset.
+     * Reads an unsigned, little-endian 16-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 2].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy 0 <= offset <= buf.length - 2
      * @returns { number } Reads an unsigned, little-endian 16-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 2. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readUInt16LE(offset?: number): number;
 
@@ -1914,16 +2095,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 32-bit, big-endian, unsigned integer from this Buffer instance at the specified offset.
+     * Reads an unsigned, big-endian 32-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 4].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy 0 <= offset <= buf.length - 4
      * @returns { number } Reads an unsigned, big-endian 32-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 4. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readUInt32BE(offset?: number): number;
 
@@ -1949,16 +2131,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads a 32-bit, little-endian, unsigned integer from this Buffer instance at the specified offset.
+     * Reads an unsigned, little-endian 32-bit integer from buf at the specified offset
      *
-     * @param { number } [offset] - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - 4].
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to read. Must satisfy 0 <= offset <= buf.length - 4
      * @returns { number } Reads an unsigned, little-endian 32-bit integer
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @throws { BusinessError } 10200001 - The value of "offset" is out of range. It must be >= 0 and <= buf.length - 4. Received value is: [offset]
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readUInt32LE(offset?: number): number;
 
@@ -1992,11 +2175,11 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads the specified number of bytes from this Buffer instance at the specified offset, and interprets the result as an unsigned,
-     * big-endian integer that supports up to 48 bits of precision.
+     * Reads byteLength number of bytes from buf at the specified offset and interprets the result as
+     * an unsigned big-endian integer supporting up to 48 bits of accuracy.
      *
-     * @param { number } offset - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - byteLength].
-     * @param { number } byteLength - Number of bytes to read. The value range is [1, 6].
+     * @param { number } offset - offset offset Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - byteLength
+     * @param { number } byteLength - byteLength byteLength Number of bytes to read. Must satisfy 0 < byteLength <= 6
      * @returns { number }
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2005,7 +2188,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readUIntBE(offset: number, byteLength: number): number;
 
@@ -2039,11 +2223,11 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Reads the specified number of bytes from this Buffer instance at the specified offset, and interprets the result as an unsigned,
-     * little-endian integer that supports up to 48 bits of precision.
+     * Reads byteLength number of bytes from buf at the specified offset and interprets the result as an unsigned,
+     * little-endian integer supporting up to 48 bits of accuracy.
      *
-     * @param { number } offset - Number of bytes to skip before starting to read data. The default value is 0. The value range is [0, Buffer.length - byteLength].
-     * @param { number } byteLength - Number of bytes to read. The value range is [1, 6].
+     * @param { number } offset - offset offset Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - byteLength
+     * @param { number } byteLength - byteLength byteLength Number of bytes to read. Must satisfy 0 < byteLength <= 6
      * @returns { number }
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2052,7 +2236,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readUIntLE(offset: number, byteLength: number): number;
 
@@ -2076,15 +2261,16 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Truncates this Buffer instance from the specified position to create a new Buffer instance.
+     * Returns a new Buffer that references the same memory as the original, but offset and cropped by the start and end indices.
      *
-     * @param { number } [start] - Offset to the start position in this Buffer instance where data is truncated. The default value is 0.
-     * @param { number } [end] - Offset to the end position in this Buffer instance (not inclusive). The default value is the length of this Buffer instance.
+     * @param { number } [start] - start [start = 0] Where the new Buffer will start
+     * @param { number } [end] - end [end = buf.length] Where the new Buffer will end (not inclusive)
      * @returns { Buffer } Returns a new Buffer that references the same memory as the original
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     subarray(start?: number, end?: number): Buffer;
 
@@ -2106,14 +2292,15 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Interprets this Buffer instance as an array of unsigned 16-bit integers and swaps the byte order in place.
+     * Interprets buf as an array of unsigned 16-bit integers and swaps the byte order in-place.
      *
      * @returns { Buffer } A reference to buf
      * @throws { BusinessError } 10200009 - The buffer size must be a multiple of 16-bits
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     swap16(): Buffer;
 
@@ -2135,14 +2322,15 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Interprets this Buffer instance as an array of unsigned 32-bit integers and swaps the byte order in place.
+     * Interprets buf as an array of unsigned 32-bit integers and swaps the byte order in-place.
      *
      * @returns { Buffer } A reference to buf
      * @throws { BusinessError } 10200009 - The buffer size must be a multiple of 32-bits
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     swap32(): Buffer;
 
@@ -2164,14 +2352,15 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Interprets this Buffer instance as an array of unsigned 64-bit integers and swaps the byte order in place.
+     * Interprets buf as an array of unsigned 64-bit integers and swaps the byte order in-place.
      *
      * @returns { Buffer } A reference to buf
      * @throws { BusinessError } 10200009 - The buffer size must be a multiple of 64-bits
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     swap64(): Buffer;
 
@@ -2191,7 +2380,7 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Converts this Buffer instance into a JSON object.
+     * Returns a JSON representation of buf
      *
      * @returns { Object } Returns a JSON
      * @syscap SystemCapability.Utils.Lang
@@ -2225,11 +2414,11 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Converts the data at the specified position in this Buffer instance into a string in the specified encoding format.
+     * Decodes buf to a string according to the specified character encoding in encoding
      *
-     * @param { string } [encoding] - Encoding format (valid only when value is a string). The default value is 'utf8'.
-     * @param { number } [start] - Offset to the start position of the data to convert. The default value is 0.
-     * @param { number } [end] - Offset to the end position of the data to convert. The default value is the length of this Buffer instance.
+     * @param { string } [encoding] - encoding [encoding='utf8'] The character encoding to use
+     * @param { number } [start] - start [start = 0] The byte offset to start decoding at
+     * @param { number } [end] - end [end = buf.length] The byte offset to stop decoding at (not inclusive)
      * @returns { string }
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types.
      * @syscap SystemCapability.Utils.Lang
@@ -2239,6 +2428,21 @@ declare namespace buffer {
      */
     toString(encoding?: string, start?: number, end?: number): string;
 
+    /**
+     * Decodes buf to a string according to the specified character encoding in encoding
+     *
+     * @param { BufferEncoding } [encoding] - encoding [encoding='utf8'] The character encoding to use
+     * @param { number } [start] - start [start = 0] The byte offset to start decoding at
+     * @param { number } [end] - end [end = buf.length] The byte offset to stop decoding at (not inclusive)
+     * @returns { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    toString(encoding?: BufferEncoding, start?: number, end?: number): string;
+
     /**
      * Writes string to buf at offset according to the character encoding in encoding
      *
@@ -2271,12 +2475,12 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a string of the specified length to this Buffer instance at the specified position in the given encoding format.
+     * Writes string to buf at offset according to the character encoding in encoding
      *
-     * @param { string } str - String to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0.
-     * @param { number } [length] - Maximum number of bytes to write. The default value is Buffer.length minus offset.
-     * @param { string } [encoding] - Encoding format of the string. The default value is 'utf8'.
+     * @param { string } str - str str Writes string to buf at offset according to the character encoding in encoding
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to write string
+     * @param { number } [length] - length [length = buf.length - offset] Maximum number of bytes to write (written bytes will not exceed buf.length - offset)
+     * @param { string } [encoding] - encoding [encoding='utf8'] The character encoding of string.
      * @returns { number } Number of bytes written.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2285,7 +2489,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     write(str: string, offset?: number, length?: number, encoding?: string): number;
 
@@ -2318,10 +2523,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 64-bit, big-endian, signed big integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as big-endian.
      *
-     * @param { bigint } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 8].
+     * @param { bigint } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0]  Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 8
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2331,7 +2536,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeBigInt64BE(value: bigint, offset?: number): number;
 
@@ -2365,10 +2571,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 64-bit, little-endian, signed big integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as little-endian.
      *
-     * @param { bigint } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 8].
+     * @param { bigint } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0]  Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 8
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2378,7 +2584,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeBigInt64LE(value: bigint, offset?: number): number;
 
@@ -2412,10 +2619,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 64-bit, big-endian, unsigned big integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as big-endian.
      *
-     * @param { bigint } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 8].
+     * @param { bigint } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0]  Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 8
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2425,7 +2632,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeBigUInt64BE(value: bigint, offset?: number): number;
 
@@ -2459,10 +2667,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 64-bit, little-endian, unsigned big integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as little-endian.
      *
-     * @param { bigint } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 8].
+     * @param { bigint } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0]  Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 8
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2472,7 +2680,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeBigUInt64LE(value: bigint, offset?: number): number;
 
@@ -2504,10 +2713,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 64-bit, big-endian, double-precision floating-point number to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as big-endian.
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 8].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0]  Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 8
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2516,7 +2725,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeDoubleBE(value: number, offset?: number): number;
 
@@ -2548,10 +2758,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 64-bit, little-endian, double-precision floating-point number to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as little-endian.
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 8].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0]  Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 8
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2560,7 +2770,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeDoubleLE(value: number, offset?: number): number;
 
@@ -2592,10 +2803,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 32-bit, big-endian, single-precision floating-point number to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as big-endian.
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 4].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0]  Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 4
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2604,7 +2815,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeFloatBE(value: number, offset?: number): number;
 
@@ -2636,10 +2848,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 32-bit, little-endian, single-precision floating-point number to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as little-endian.
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 4].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0]  Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 4
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2648,7 +2860,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeFloatLE(value: number, offset?: number): number;
 
@@ -2682,10 +2895,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes an 8-bit signed integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset. value must be a valid signed 8-bit integer.
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 1].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 1
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2695,7 +2908,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeInt8(value: number, offset?: number): number;
 
@@ -2729,10 +2943,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 16-bit, big-endian, signed integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as big-endian. The value must be a valid signed 16-bit integer
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 2].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 2
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2742,7 +2956,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeInt16BE(value: number, offset?: number): number;
 
@@ -2776,10 +2991,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 16-bit, little-endian, signed integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as little-endian. The value must be a valid signed 16-bit integer
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 2].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 2
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2789,7 +3004,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeInt16LE(value: number, offset?: number): number;
 
@@ -2823,10 +3039,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 32-bit, big-endian, signed integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as big-endian. The value must be a valid signed 32-bit integer.
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 4].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 4
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2836,7 +3052,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeInt32BE(value: number, offset?: number): number;
 
@@ -2870,10 +3087,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 32-bit, little-endian, signed integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as little-endian. The value must be a valid signed 32-bit integer.
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 4].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 4
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2883,7 +3100,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeInt32LE(value: number, offset?: number): number;
 
@@ -2917,11 +3135,11 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a big-endian signed value of the specified length to this Buffer instance at the specified offset.
+     * Writes byteLength bytes of value to buf at the specified offset as big-endian
      *
-     * @param { number } value - Data to write.
-     * @param { number } offset - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - byteLength].
-     * @param { number } byteLength - Number of bytes to write.
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } offset - offset offset Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - byteLength
+     * @param { number } byteLength - byteLength byteLength Number of bytes to write. Must satisfy 0 < byteLength <= 6
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2930,7 +3148,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeIntBE(value: number, offset: number, byteLength: number): number;
 
@@ -2964,11 +3183,11 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a little-endian signed value of the specified length to this Buffer instance at the specified offset.
+     * Writes byteLength bytes of value to buf at the specified offset as little-endian
      *
-     * @param { number } value - Data to write.
-     * @param { number } offset - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - byteLength].
-     * @param { number } byteLength - Number of bytes to write.
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } offset - offset offset  Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - byteLength
+     * @param { number } byteLength - byteLength byteLength Number of bytes to write. Must satisfy 0 < byteLength <= 6
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -2977,7 +3196,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeIntLE(value: number, offset: number, byteLength: number): number;
 
@@ -3011,10 +3231,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes an 8-bit unsigned integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset. value must be a valid unsigned 8-bit integer
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 1].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - 1
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -3024,7 +3244,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeUInt8(value: number, offset?: number): number;
 
@@ -3058,10 +3279,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 16-bit, big-endian, unsigned integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as big-endian. The value must be a valid unsigned 16-bit integer.
      *
-     * @param { number } value - 	Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 2].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - 2
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -3071,7 +3292,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeUInt16BE(value: number, offset?: number): number;
 
@@ -3105,10 +3327,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 16-bit, little-endian, unsigned integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as little-endian. The value must be a valid unsigned 16-bit integer.
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 2].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - 2
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -3118,7 +3340,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeUInt16LE(value: number, offset?: number): number;
 
@@ -3152,10 +3375,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 32-bit, big-endian, unsigned integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as big-endian. The value must be a valid unsigned 32-bit integer.
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 4].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - 4
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -3165,7 +3388,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeUInt32BE(value: number, offset?: number): number;
 
@@ -3199,10 +3423,10 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes a 32-bit, little-endian, unsigned integer to this Buffer instance at the specified offset.
+     * Writes value to buf at the specified offset as little-endian. The value must be a valid unsigned 32-bit integer.
      *
-     * @param { number } value - Data to write.
-     * @param { number } [offset] - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - 4].
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } [offset] - offset [offset = 0] Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - 4
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -3212,7 +3436,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeUInt32LE(value: number, offset?: number): number;
 
@@ -3246,11 +3471,11 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes an unsigned big-endian value of the specified length to this Buffer instance at the specified offset.
+     * Writes byteLength bytes of value to buf at the specified offset as big-endian
      *
-     * @param { number } value - Data to write.
-     * @param { number } offset - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - byteLength].
-     * @param { number } byteLength - Number of bytes to write.
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } offset - offset offset Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - byteLength
+     * @param { number } byteLength - byteLength byteLength Number of bytes to write. Must satisfy 0 < byteLength <= 6
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -3259,7 +3484,8 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeUIntBE(value: number, offset: number, byteLength: number): number;
 
@@ -3293,11 +3519,11 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Writes an unsigned little-endian value of the specified length to this Buffer instance at the specified offset.
+     * Writes byteLength bytes of value to buf at the specified offset as little-endian
      *
-     * @param { number } value - Data to write.
-     * @param { number } offset - Number of bytes to skip before starting to write data. The default value is 0. The value range is [0, Buffer.length - byteLength].
-     * @param { number } byteLength - Number of bytes to write.
+     * @param { number } value - value value Number to be written to buf
+     * @param { number } offset - offset offset Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - byteLength
+     * @param { number } byteLength - byteLength byteLength Number of bytes to write. Must satisfy 0 < byteLength <= 6
      * @returns { number } offset plus the number of bytes written
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -3306,9 +3532,70 @@ declare namespace buffer {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     writeUIntLE(value: number, offset: number, byteLength: number): number;
+
+    /**
+     * Returns the byte at the specified index.
+     *
+     * @param { number } index - byte index to read
+     * @returns { number | undefined } Returns the byte value at `index`
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    $_get(index: number): number | undefined;
+
+    /**
+     * Sets the byte at the specified index.
+     *
+     * @param { number } index – byte index to write
+     * @param { number } value – byte value (0–255)
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    $_set(index: number, value: number): void;
+  }
+
+  /**
+   * Defines the Blob related options parameters.
+   *
+   * @interface BlobOptions
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  interface BlobOptions {
+    /**
+     * Blob content type. The default parameter is' '.
+     * @type { ?string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    type?: string;
+
+    /**
+     * How to output a string ending with '\ n' as' transparent or native . The default value is transparent.
+     * @type { ?string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    endings?: string;
   }
 
   /**
@@ -3330,7 +3617,8 @@ declare namespace buffer {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   class Blob {
     /**
@@ -3363,15 +3651,13 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * A constructor used to create a Blob instance.
+     * Creates a new Blob object containing a concatenation of the given sources.
      *
-     * @param { string[] | ArrayBuffer[] | TypedArray[] | DataView[] | Blob[] } sources - Data sources of the Blob instance.
-     * @param { Object } options:
-     * - endings: specifies how the terminator '\n' is output. The value can be 'native' or 'transparent'. 'native'
-     * means that the terminator follows the system. 'transparent' means that the terminator stored in the Blob
-     * instance remains unchanged. The default value is 'transparent'.
-     * - type: type of the data in the Blob instance. This type represents the MIME type of the data. However,
-     * it is not used for type format validation. The default value is ''.
+     * @param { string[] | ArrayBuffer[] | TypedArray[] | DataView[] | Blob[] } sources - sources sources An array of string, <ArrayBuffer>,
+     * <TypedArray>, <DataView>, or <Blob> objects, or any mix of such objects, that will be stored within the Blob
+     * @param { Object } [options] - options options {endings: string, type: string}
+     *                 endings:  One of either 'transparent' or 'native'.
+     *                 type: The Blob content-type
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types.
@@ -3382,6 +3668,25 @@ declare namespace buffer {
      */
     constructor(sources: string[] | ArrayBuffer[] | TypedArray[] | DataView[] | Blob[], options?: Object);
 
+    /**
+     * Creates a new Blob object containing a concatenation of the given sources.
+     *
+     * @param { Array<TypedArray> | Array<string> | Array<ArrayBuffer> | Array<DataView> | Array<Blob> } sources - sources sources An array of string, <ArrayBuffer>,
+     * <TypedArray>, <DataView>, or <Blob> objects, or any mix of such objects, that will be stored within the Blob
+     * @param { BlobOptions } [options] - options options {endings: string, type: string}
+     *                 endings:  One of either 'transparent' or 'native'.
+     *                 type: The Blob content-type
+     * @throws { BusinessError } 401 - Parameter error. Possible causes:
+     * 1.Mandatory parameters are left unspecified;
+     * 2.Incorrect parameter types.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    constructor(sources: Array<TypedArray> | Array<string> | Array<ArrayBuffer> | Array<DataView> | Array<Blob>, options?: BlobOptions);
+
     /**
      * The total size of the Blob in bytes
      *
@@ -3398,13 +3703,14 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Total size of the Blob instance, in bytes.
+     * The total size of the Blob in bytes
      *
      * @type { number }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     size: number;
 
@@ -3424,13 +3730,14 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Type of the data in the Blob instance.
+     * The content-type of the Blob
      *
      * @type { string }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     type: string;
 
@@ -3450,13 +3757,14 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Puts the Blob data into an ArrayBuffer instance. This API uses a promise to return the result.
+     * Returns a promise that fulfills with an <ArrayBuffer> containing a copy of the Blob data.
      *
      * @returns { Promise<ArrayBuffer> }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     arrayBuffer(): Promise<ArrayBuffer>;
 
@@ -3482,16 +3790,17 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Creates a Blob instance by copying specified data from this Blob instance.
+     * Creates and returns a new Blob containing a subset of this Blob objects data. The original Blob is not altered
      *
-     * @param { number } [start] - Offset to the start position of the data to copy. The default value is 0.
-     * @param { number } [end] - Offset to the end position of the data to copy. The default value is the data length in the original Blob instance.
-     * @param { string } [type] - Type of the data in the new Blob instance. The default value is ''.
+     * @param { number } [start] - start start The starting index
+     * @param { number } [end] - end end The ending index
+     * @param { string } [type] - type type The content-type for the new Blob
      * @returns { Blob }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     slice(start?: number, end?: number, type?: string): Blob;
 
@@ -3511,13 +3820,14 @@ declare namespace buffer {
      * @since 10
      */
     /**
-     * Returns text in UTF-8 format. This API uses a promise to return the result.
+     * Returns a promise that fulfills with the contents of the Blob decoded as a UTF-8 string.
      *
      * @returns { Promise<string> }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     text(): Promise<string>;
   }
diff --git a/api/@ohos.uri.d.ts b/api/@ohos.uri.d.ts
index d2de4cbfa03140478cc3d3aa6eb13c1ce6da5f0e..4073c286715ed75b9d68608a4c580dcca9bfac04 100644
--- a/api/@ohos.uri.d.ts
+++ b/api/@ohos.uri.d.ts
@@ -34,15 +34,14 @@
  * @since 10
  */
 /**
- * The uri module provides APIs for parsing URI strings that comply with the RFC3986 standard.
- * This standard defines how to encode and parse the identifiers used to locate network resources.
- * The module does not support parsing of URIs in non-standard scenarios.
+ * The uri module provides utilities for URI resolution and parsing.
  *
  * @namespace uri
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 11
+ * @since arkts {'1.1':'11', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare namespace uri {
   /**
@@ -66,7 +65,8 @@ declare namespace uri {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    * @name URI
    */
   class URI {
@@ -98,9 +98,10 @@ declare namespace uri {
      * @since 10
      */
     /**
-     * A constructor used to create a URI instance.
+     * URI constructor, which is used to instantiate a URI object.
+     * uri: Constructs a URI by parsing a given string.
      *
-     * @param { string } uri - Input object.
+     * @param { string } uri - uri uri
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      *     1.Mandatory parameters are left unspecified;
      *     2.Incorrect parameter types;
@@ -109,7 +110,8 @@ declare namespace uri {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     constructor(uri: string);
     /**
@@ -128,13 +130,14 @@ declare namespace uri {
      * @since 10
      */
     /**
-     * Converts this URI into an encoded string.
+     * Returns the serialized URI as a string.
      *
-     * @returns { string } URI in a serialized string.
+     * @returns { string } Returns the serialized URI as a string.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     toString(): string;
 
@@ -174,9 +177,9 @@ declare namespace uri {
      * @since 10
      */
     /**
-     * Checks whether this URI is the same as another URI object.
+     * Check whether this URI is equivalent to other URI objects.
      *
-     * @param { URI } other - URI object to compare.
+     * @param { URI } other - other other URI object to be compared
      * @returns { boolean } boolean Tests whether this URI is equivalent to other URI objects.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      *     1.Mandatory parameters are left unspecified;
@@ -184,7 +187,8 @@ declare namespace uri {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     equalsTo(other: URI): boolean;
 
@@ -204,13 +208,14 @@ declare namespace uri {
      * @since 10
      */
     /**
-     * Checks whether this URI is an absolute URI (whether the scheme component is defined).
+     * Indicates whether this URI is an absolute URI.
      *
      * @returns { boolean } boolean Indicates whether the URI is an absolute URI (whether the scheme component is defined).
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     checkIsAbsolute(): boolean;
 
@@ -230,18 +235,18 @@ declare namespace uri {
      * @since 10
      */
     /**
-     * Normalizes the path of this URI.
+     * Normalize the path of this URI, It is not safe to call the normalize interface with URI.
      *
      * @returns { URI } URI Used to normalize the path of this URI and return a URI object whose path has been normalized.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     normalize(): URI;
     /**
-     * Obtains the first value of a given key from the query component of this URI. If the query component contains encoded content,
-     * this API decodes the key before obtaining the value.
+     * Searches the query string for the first value with the given key.
      *
      * @param { string } key - Given the first value of the key.
      * @returns { string } Return decoded value.
@@ -255,10 +260,25 @@ declare namespace uri {
      */
     getQueryValue(key: string): string;
     /**
-     * Adds a query parameter to this URI to create a new URI, while keeping the existing URI unchanged.
+     * Searches the query string for the first value with the given key.
+     *
+     * @param { string } key - Given the first value of the key.
+     * @returns { string | null } Return decoded value, If no corresponding value is found return a null object.
+     * @throws { BusinessError } 401 - Parameter error. Possible causes:
+     *     1.Mandatory parameters are left unspecified;
+     *     2.Incorrect parameter types.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    getQueryValue(key: string): string | null;
+    /**
+     * Encodes the key and value and then appends the result to the query string.
      *
-     * @param { string } [key] - Key of the query parameter.
-     * @param { string } [value] - Value of the query parameter.
+     * @param { string } [key] - The key it will be encoded with.
+     * @param { string } [value] - The value it will be encoded with.
      * @returns { URI } Return URI object.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      *     1.Mandatory parameters are left unspecified;
@@ -266,11 +286,12 @@ declare namespace uri {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     addQueryValue(key: string, value: string): URI;
     /**
-     * Obtains all non-repeated keys in the query component of this URI. 
+     * Returns a set of the unique names of all query parameters.
      *
      * @returns { string[] } Return a set of decoded names.
      * @syscap SystemCapability.Utils.Lang
@@ -280,9 +301,20 @@ declare namespace uri {
      */
     getQueryNames(): string[];
     /**
-     * Obtains the values of a given key from the query component of this URI.
+     * Returns a set of the unique names of all query parameters.
      *
-     * @param { string } key - Key of the URI query parameter.
+     * @returns { Array<string> } Return a set of decoded names.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    getQueryNames(): Array<string>;
+    /**
+     * Searches the query string for parameter values with the given key.
+     *
+     * @param { string } key - The key it will be encoded with.
      * @returns { string[] } Return a set of decoded values.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      *     1.Mandatory parameters are left unspecified;
@@ -293,8 +325,21 @@ declare namespace uri {
      * @since 12
      */
     getQueryValues(key: string): string[];
+
     /**
-     * Obtains the value of the Boolean type of a query parameter in this URI.
+     * Searches the query string for parameter values with the given key.
+     *
+     * @param { string } key - The key it will be encoded with.
+     * @returns { Array<string> } Return a set of decoded values.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    getQueryValues(key: string): Array<string>;    
+    /**
+     * Searches the query string for the first value with the given key and interprets it as a boolean value.
      *
      * @param { string } key - Indicates the key value to be queried.
      * @param { boolean } defaultValue - The default value returned when the key has no query parameters.
@@ -305,31 +350,34 @@ declare namespace uri {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     getBooleanQueryValue(key: string, defaultValue: boolean): boolean;
     /**
-     * Clears the query component of this URI to create a new URI, while keeping the existing URI object unchanged.
+     * Clears the the previously set query.
      *
      * @returns { URI } After clearing, return the URI object.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     clearQuery(): URI;
     /**
-     * Obtains the last segment of this URI.
+     * Gets the decoded last path segment.
      *
      * @returns { string } Returns the last decoded segment, or null if the path is empty.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     getLastSegment(): string;
     /**
-     * Obtains all segments of this URI.
+     * Gets the decoded path segments.
      *
      * @returns { string[] } Return decoded path segments, each without a leading or trailing "/".
      * @syscap SystemCapability.Utils.Lang
@@ -339,8 +387,18 @@ declare namespace uri {
      */
     getSegment(): string[];
     /**
-     * Encodes a given field, appends it to the path component of this URI to create a new URI, and returns the new URI,
-     * while keeping the existing URI unchanged.
+     * Gets the decoded path segments.
+     *
+     * @returns { Array<string> } Return decoded path segments, each without a leading or trailing "/".
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    getSegment(): Array<string>;
+    /**
+     * Encodes the given path segment and appends it to the path.
      *
      * @param { string } [pathSegment] - path segment to be added.
      * @returns { URI } After adding, return the URI object.
@@ -350,12 +408,12 @@ declare namespace uri {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     addSegment(pathSegment: string): URI;
     /**
-     * Appends an encoded field to the path component of this URI to create a new URI and returns the new URI,
-     * while keeping the existing URI unchanged.
+     * Creates a new Uri by appending an already-encoded path segment to a base Uri.
      *
      * @param { string } pathSegment - Encoding path segment to be added.
      * @returns { URI } After adding, return the URI object.
@@ -365,42 +423,45 @@ declare namespace uri {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     addEncodedSegment(pathSegment: string): URI;
     /**
-     * Checks whether this URI is a hierarchical URI. The URI that starts with a slash (/) in scheme-specific-part is a
-     * hierarchical URI. Relative URIs are also hierarchical.
+     * Determine whether URI is hierarchical.
      *
      * @returns { boolean } Return true as Hierarchical, otherwise return false.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     checkHierarchical(): boolean;
     /**
-     * Checks whether this URI is an opaque URI. The URI that does not start with a slash (/) is an opaque URI.
+     * Determine whether URI is Opaque.
      *
      * @returns { boolean } Return true as Opaque, otherwise return false.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     checkOpaque(): boolean;
     /**
-     * Checks whether this URI is a relative URI. A relative URI does not contain the scheme component.
+     * Determine whether URI is Relative.
      *
      * @returns { boolean } Return true as Relative, otherwise return false.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     checkRelative(): boolean;
     /**
-     * Creates a URI based on the provided scheme, scheme-specific-part, and fragment components.
+     * Creates an opaque Uri from the given components.
      *
      * @param { string } scheme -  of the URI.
      * @param { string } ssp -scheme-specific-part, everything between the scheme separator (':') and the fragment
@@ -413,7 +474,8 @@ declare namespace uri {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     static createFromParts(scheme: string, ssp: string, fragment: string): URI;
     /**
@@ -773,6 +835,334 @@ declare namespace uri {
      * @since 12
      */
     encodedSSP: string;
+    /**
+     * Gets the protocol part of the URI.
+     *
+     * @type { string | null }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get scheme(): string | null;
+
+    /**
+     * Sets the protocol part of the URI.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set scheme(input: string | null);
+
+    /**
+     * Gets Obtains the user information part of the URI.
+     *
+     * @type { string | null }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get userInfo(): string | null;
+
+    /**
+     * Sets Obtains the user information part of the URI.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set userInfo(input: string | null);
+
+    /**
+     * Gets the hostname portion of the URI without a port.
+     *
+     * @type { string | null }
+     * @syscap SystemCapability.Utils.Lang
+     * @since 20
+     * @arkts 1.2
+     */
+    get host(): string | null;
+
+    /**
+     * Gets the port portion of the URI.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @since 20
+     * @arkts 1.2
+     */
+    get port(): string;
+
+    /**
+     * Gets the path portion of the URI.
+     *
+     * @type { string | null }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get path(): string | null;
+
+    /**
+     * Sets the path portion of the URI.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set path(input: string | null);
+
+    /**
+     * Gets the query portion of the URI
+     *
+     * @type { string | null }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get query(): string | null;
+
+    /**
+     * Sets the query portion of the URI
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set query(input: string | null);
+
+    /**
+     * Gets the fragment part of the URI.
+     *
+     * @type { string | null }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get fragment(): string | null;
+
+    /**
+     * Sets the fragment part of the URI.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set fragment(input: string | null);
+
+    /**
+     * Gets the decoding permission component part of this URI.
+     *
+     * @type { string | null }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get authority(): string | null;
+
+    /**
+     * Sets the decoding permission component part of this URI.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set authority(input: string | null);
+
+    /**
+     * Gets the decoding scheme-specific part of the URI.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get ssp(): string;
+
+    /**
+     * Sets the decoding scheme-specific part of the URI.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set ssp(input: string | null);
+
+    /**
+     * Gets Obtains the encoded user information part of the URI.
+     *
+     * @type { string | null }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get encodedUserInfo(): string | null;
+    /**
+     * Sets Obtains the encoded user information part of the URI.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set encodedUserInfo(input: string | null);
+
+    /**
+     * Gets the encoded path portion of the URI.
+     *
+     * @type { string | null }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get encodedPath(): string | null;
+    /**
+     * Sets the encoded path portion of the URI.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set encodedPath(input: string | null);
+
+    /**
+     * Gets the encoded query component from this URI.
+     *
+     * @type { string | null }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get encodedQuery(): string | null;
+    /**
+     * Sets the encoded query component from this URI.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set encodedQuery(input: string | null);
+
+    /**
+     * Gets the encoded fragment part of this URI, everything after the '#'.
+     *
+     * @type { string | null }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get encodedFragment(): string | null;
+    /**
+     * Sets the encoded fragment part of this URI, everything after the '#'.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set encodedFragment(input: string | null);
+
+    /**
+     * Gets the encoded authority part of this URI.
+     *
+     * @type { string | null }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get encodedAuthority(): string | null;
+    /**
+     * Sets the encoded authority part of this URI.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set encodedAuthority(input: string | null);
+
+    /**
+     * Gets the scheme-specific part of this URI, i.e. everything between the scheme separator ':' and
+     * the fragment separator '#'.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get encodedSSP(): string;
+
+    /**
+     * Sets the scheme-specific part of this URI, i.e. everything between the scheme separator ':' and
+     * the fragment separator '#'.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set encodedSSP(input: string | null)
   }
 }
 export default uri;
diff --git a/api/@ohos.url.d.ts b/api/@ohos.url.d.ts
index ad5a9b4df0ee25884f019ea1852e6c6b841734a0..6045d1ad259105e45196b4837f2fae8564c69ce5 100644
--- a/api/@ohos.url.d.ts
+++ b/api/@ohos.url.d.ts
@@ -34,13 +34,14 @@
  * @since 10
  */
 /**
- * The url module provides APIs for parsing URL strings and constructing URL instances to process URL strings.
+ * The url module provides utilities for URL resolution and parsing.
  *
  * @namespace url
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 11
+ * @since arkts {'1.1':'11', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare namespace url {
   /**
@@ -244,7 +245,8 @@ declare namespace url {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    * @name URLParams
    */
   class URLParams {
@@ -276,14 +278,14 @@ declare namespace url {
      * @since 10
      */
     /**
-     * A constructor used to create a URLParams instance.
+     * A parameterized constructor used to create an URLParams instance.
+     * As the input parameter of the constructor function, init supports four types.
+     * The input parameter is a character string two-dimensional array.
+     * The input parameter is the object list.
+     * The input parameter is a character string.
+     * The input parameter is the URLParams object.
      *
-     * @param { string[][] | Record<string, string> | string | URLParams } [init] - Input parameter objects, which include the following:
-     * - string[][]: two-dimensional string array.
-     * - Record<string, string>: list of objects.
-     * - string: string.
-     * - URLParams: object.
-     * The default value is null.
+     * @param { string[][] | Record<string, string> | string | URLParams } [init] - init init
      * @throws { BusinessError } 401 - Parameter error. Possible causes: 1.Incorrect parameter types; 2.Parameter verification failed.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
@@ -292,6 +294,23 @@ declare namespace url {
      */
     constructor(init?: string[][] | Record<string, string> | string | URLParams);
 
+    /**
+     * A parameterized constructor used to create an URLParams instance.
+     * As the input parameter of the constructor function, init supports four types.
+     * The input parameter is a character string two-dimensional array.
+     * The input parameter is the object list.
+     * The input parameter is a character string.
+     * The input parameter is the URLParams object.
+     *
+     * @param { [string, string][] | Record<string, string> | string | URLParams } [init] - init init
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    constructor(init?: [string, string][] | Record<string, string> | string | URLParams);
+
     /**
      * Appends a specified key/value pair as a new search parameter.
      *
@@ -318,10 +337,10 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Appends a key-value pair into the query string.
+     * Appends a specified key/value pair as a new search parameter.
      *
-     * @param { string } name - Key of the key-value pair to append.
-     * @param { string } value - Value of the key-value pair to append.
+     * @param { string } name - name name Key name of the search parameter to be inserted.
+     * @param { string } value - value value Values of search parameters to be inserted.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types;
@@ -329,7 +348,8 @@ declare namespace url {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     append(name: string, value: string): void;
 
@@ -357,9 +377,9 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Deletes key-value pairs of the specified key.
+     * Deletes the given search parameter and its associated value,from the list of all search parameters.
      *
-     * @param { string } name - Key of the key-value pairs to delete.
+     * @param { string } name - name name Name of the key-value pair to be deleted.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types;
@@ -367,7 +387,8 @@ declare namespace url {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     delete(name: string): void;
 
@@ -397,9 +418,9 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Obtains all the values based on the specified key.
+     * Returns all key-value pairs associated with a given search parameter as an array.
      *
-     * @param { string } name - Target key.
+     * @param { string } name - name name Specifies the name of a key value.
      * @returns { string[] } string[] Returns all key-value pairs with the specified name.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -412,6 +433,19 @@ declare namespace url {
      */
     getAll(name: string): string[];
 
+    /**
+    * Returns all key-value pairs associated with a given search parameter as an array.
+    *
+    * @param { string } name - name name Specifies the name of a key value.
+    * @returns { Array<string> } Array<string> Returns all key-value pairs with the specified name.
+    * @syscap SystemCapability.Utils.Lang
+    * @crossplatform
+    * @atomicservice
+    * @since 20
+    * @arkts 1.2
+    */
+    getAll(name: string): Array<string>;
+
     /**
      * Returns an ES6 iterator. Each item of the iterator is a JavaScript Array.
      * The first item of Array is name, and the second item of Array is value.
@@ -430,14 +464,15 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Obtains an ES6 iterator. Each item of the iterator is a JavaScript array, and the first and second fields of
-     * each array are the key and value respectively.
+     * Returns an ES6 iterator. Each item of the iterator is a JavaScript Array.
+     * The first item of Array is name, and the second item of Array is value.
      *
      * @returns { IterableIterator<[string, string]> } Returns an iterator for ES6.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     entries(): IterableIterator<[string, string]>;
 
@@ -469,10 +504,11 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Traverses the key-value pairs in the URLSearchParams instance by using a callback.
+     * Callback functions are used to traverse key-value pairs on the URLParams instance object.
      *
-     * @param { function } callbackFn - Callback invoked to traverse the key-value pairs in the URLSearchParams instance.
-     * @param { Object } [thisArg] - Value of this to use when callbackFn is invoked. The default value is this object.
+     * @param { function } callbackFn - callbackFn value Current traversal key value,
+	 * key Indicates the name of the key that is traversed.
+     * @param { Object } [thisArg] - thisArg thisArg to be used as this value for when callbackFn is called
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types;
@@ -484,6 +520,18 @@ declare namespace url {
      */
     forEach(callbackFn: (value: string, key: string, searchParams: URLParams) => void, thisArg?: Object): void;
 
+    /**
+     * Iterates over a collection (e.g., URLs) and executes a callback function for each element.
+     *
+     * @param { UrlCbFn } callbackFn - A callback function to execute for each element.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    forEach(callbackFn: UrlCbFn): void;
+
     /**
      * Returns the first value associated to the given search parameter.
      *
@@ -510,9 +558,9 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Obtains the value of the first key-value pair based on the specified key.
+     * Returns the first value associated to the given search parameter.
      *
-     * @param { string } name - Key specified to obtain the value.
+     * @param { string } name - name name Specifies the name of a key-value pair.
      * @returns { string | null } Returns the first value found by name. If no value is found, null is returned.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -525,6 +573,20 @@ declare namespace url {
      */
     get(name: string): string | null;
 
+    /**
+     * Returns the first value associated to the given search parameter.
+     *
+     * @param { string } name - name name Specifies the name of a key-value pair.
+     * @returns { string | undefined } Returns the first value found by name. 
+     * If no value is found, undefined is returned.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get(name: string): string | undefined;
+
     /**
      * Returns a Boolean that indicates whether a parameter with the specified name exists.
      *
@@ -549,9 +611,9 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Checks whether a key has a value.
+     * Returns a Boolean that indicates whether a parameter with the specified name exists.
      *
-     * @param { string } name - Key specified to search for its value.
+     * @param { string } name - name name Specifies the name of a key-value pair.
      * @returns { boolean } Returns a Boolean value that indicates whether a found
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -559,7 +621,8 @@ declare namespace url {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     has(name: string): boolean;
 
@@ -595,12 +658,13 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Sets the value for a key. If key-value pairs matching the specified key exist, the value of the first key-value
-     * pair will be set to the specified value and other key-value pairs will be deleted. Otherwise, the key-value pair
-     * will be appended to the query string.
+     * Sets the value associated with a given search parameter to the
+     * given value. If there were several matching values, this method
+     * deletes the others. If the search parameter doesn't exist, this
+     * method creates it.
      *
-     * @param { string } name - Key of the value to set.
-     * @param { string } value - Value to set.
+     * @param { string } name - name name Key name of the parameter to be set.
+     * @param { string } value - value value Indicates the parameter value to be set.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types;
@@ -608,7 +672,8 @@ declare namespace url {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     set(name: string, value: string): void;
 
@@ -626,14 +691,13 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Sorts all key-value pairs contained in this object based on the Unicode code points of the keys and returns
-     * undefined. This method uses a stable sorting algorithm, that is, the relative order between key-value pairs
-     * with equal keys is retained.
+     * Sort all key/value pairs contained in this object in place and return undefined.
      *
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     sort(): void;
 
@@ -653,13 +717,14 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Obtains an ES6 iterator that contains the keys of all the key-value pairs.
+     * Returns an iterator allowing to go through all keys contained in this object.
      *
      * @returns { IterableIterator<string> } Returns an ES6 Iterator over the names of each name-value pair.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     keys(): IterableIterator<string>;
 
@@ -679,13 +744,14 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Obtains an ES6 iterator that contains the values of all the key-value pairs.
+     * Returns an iterator allowing to go through all values contained in this object.
      *
      * @returns { IterableIterator<string> } Returns an ES6 Iterator over the values of each name-value pair.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     values(): IterableIterator<string>;
 
@@ -709,8 +775,8 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Obtains an ES6 iterator. Each item of the iterator is a JavaScript array, and the first and second fields ofeach array are
-     * the key and value respectively.
+     * Returns an iterator allowing to go through all key/value
+     * pairs contained in this object.
      *
      * @returns { IterableIterator<[string, string]> } Returns an ES6 iterator. Each item of the iterator is a JavaScript Array.
      * The first item of Array is name, and the second item of Array is value.
@@ -721,6 +787,21 @@ declare namespace url {
      */
     [Symbol.iterator](): IterableIterator<[string, string]>;
 
+    /**
+     * Returns an iterator allowing to go through all key/value
+     * pairs contained in this object.
+     *
+     * @returns { IterableIterator<[string, string]> } Returns an ES6 iterator.
+     * Each item of the iterator is a JavaScript Array.
+     * The first item of Array is name, and the second item of Array is value.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    $_iterator(): IterableIterator<[string, string]>;
+
     /**
      * Returns a query string suitable for use in a URL.
      *
@@ -737,13 +818,14 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Obtains search parameters that are serialized as a string and, if necessary, percent-encodes the characters in the string.
+     * Returns a query string suitable for use in a URL.
      *
      * @returns { string } Returns a search parameter serialized as a string, percent-encoded if necessary.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     toString(): string;
   }
@@ -769,7 +851,8 @@ declare namespace url {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    * @name URL
    */
   class URL {
@@ -802,13 +885,13 @@ declare namespace url {
      * @since 10
      */
     /**
-     * A no-argument constructor used to create a URL. It returns a URL object after parseURL is called.
-     * It is not used independently.
+     * URL constructor, which is used to instantiate a URL object.
      *
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     constructor();
 
@@ -844,16 +927,11 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Parses a URL.
+     * Replaces the original constructor to process arguments and return a url object.
      *
-     * @param { string } url - A string representing an absolute or a relative URL.
-     * In the case of a relative URL, you must specify base to parse the final URL.
-     * In the case of an absolute URL, the passed base will be ignored.
+     * @param { string } url - url url Absolute or relative input URL to resolve. Base is required if input is relative.
      * If input is an absolute value, base ignores the value.
-     * @param { string | URL } [base] - Either a string or an object. The default value is undefined.
-     * - string: string.
-     * - URL: URL object.
-     * This parameter is used when url is a relative URL.
+     * @param { string | URL } [base] - base base Base URL to parse if input is not absolute.
      * @returns { URL }
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
@@ -863,7 +941,8 @@ declare namespace url {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     static parseURL(url: string, base?: string | URL): URL;
 
@@ -883,13 +962,14 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Converts the parsed URL into a string.
+     * Returns the serialized URL as a string.
      *
      * @returns { string } Returns the serialized URL as a string.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     toString(): string;
 
@@ -909,13 +989,14 @@ declare namespace url {
      * @since 10
      */
     /**
-     * Converts the parsed URL into a JSON string.
+     * Returns the serialized URL as a string.
      *
      * @returns { string } Returns the serialized URL as a string.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     toJSON(): string;
 
@@ -1179,6 +1260,271 @@ declare namespace url {
      * @since 11
      */
     search: string;
+  
+    /**
+     * Gets and sets the fragment portion of the URL.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get hash(): string;
+
+    /**
+     * Gets and sets the fragment portion of the URL.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set hash(hash: string);
+
+    /**
+     * Gets and sets the host portion of the URL.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get host(): string;
+
+    /**
+    * Gets and sets the host portion of the URL.
+    *
+    * @type { string }
+    * @syscap SystemCapability.Utils.Lang
+    * @crossplatform
+    * @atomicservice
+    * @since 20
+    * @arkts 1.2
+    */
+    set host(host: string);
+
+    /**
+     * Gets and sets the host name portion of the URL，not include the port.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get hostname(): string;
+
+    /**
+    * Gets and sets the host name portion of the URL，not include the port.
+    *
+    * @type { string }
+    * @syscap SystemCapability.Utils.Lang
+    * @crossplatform
+    * @atomicservice
+    * @since 20
+    * @arkts 1.2
+    */
+    set hostname(hostname: string);
+
+    /**
+     * Gets and sets the serialized URL.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get href(): string;
+
+    /**
+     * Gets and sets the serialized URL.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set href(href: string);
+
+    /**
+     * Gets the read-only serialization of the URL's origin.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get origin(): string;
+
+    /**
+     * Gets and sets the password portion of the URL.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get password(): string;
+
+    /**
+     * Gets and sets the password portion of the URL.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    set password(password: string);
+
+    /**
+     * Gets and sets the path portion of the URL.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get pathname(): string;
+
+    /**
+    * Gets and sets the path portion of the URL.
+    *
+    * @type { string }
+    * @syscap SystemCapability.Utils.Lang
+    * @crossplatform
+    * @atomicservice
+    * @since 20
+    * @arkts 1.2
+    */
+    set pathname(pathname: string);
+
+    /**
+     * Gets and sets the port portion of the URL.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get port(): string;
+
+    /**
+    * Gets and sets the port portion of the URL.
+    *
+    * @type { string }
+    * @syscap SystemCapability.Utils.Lang
+    * @crossplatform
+    * @atomicservice
+    * @since 20
+    * @arkts 1.2
+    */
+    set port(port: string);
+
+    /**
+     * Gets and sets the protocol portion of the URL.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get protocol(): string;
+
+    /**
+    * Gets and sets the protocol portion of the URL.
+    *
+    * @type { string }
+    * @syscap SystemCapability.Utils.Lang
+    * @crossplatform
+    * @atomicservice
+    * @since 20
+    * @arkts 1.2
+    */
+    set protocol(protocol: string);
+
+    /**
+     * Gets and sets the serialized query portion of the URL.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get search(): string;
+
+    /**
+   * Gets and sets the serialized query portion of the URL.
+   *
+   * @type { string }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+    set search(search: string);
+    /**
+     * Gets the URLParams object that represents the URL query parameter.
+     * This property is read-only, but URLParams provides an object that can be used to change
+     * the URL instance. To replace the entire query parameter for a URL, use url.searchsetter.
+     *
+     * @type { URLParams }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get params(): URLParams;
+
+    /**
+     * Gets and sets the username portion of the URL.
+     *
+     * @type { string }
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    get username(): string;
+
+    /**
+    * Gets and sets the username portion of the URL.
+    *
+    * @type { string }
+    * @syscap SystemCapability.Utils.Lang
+    * @crossplatform
+    * @atomicservice
+    * @since 20
+    * @arkts 1.2
+    */
+    set username(username: string);
 
     /**
      * Gets the URLSearchParams object that represents the URL query parameter.
@@ -1251,5 +1597,20 @@ declare namespace url {
      */
     username: string;
   }
+
+    /**
+     * The type of URL callback function.
+     *
+     * @typedef { function } UrlCbFn
+     * @param { string } value - The value of the URL parameter.
+     * @param { string } key - The key of the URL parameter.
+     * @param { URLParams } searchParams - The URLParams object containing all parameters.
+     * @returns { void } This callback does not return a value.
+     * @syscap SystemCapability.Utils.Lang
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    type UrlCbFn = (value: string, key: string, searchParams: URLParams) => void;
 }
 export default url;
diff --git a/api/@ohos.util.ArrayList.d.ts b/api/@ohos.util.ArrayList.d.ts
index 284a6b70236b17af70f23b249eb7f3535af5cd4c..ae103a8bfc06d97b7157565bb4ca518854e74340 100644
--- a/api/@ohos.util.ArrayList.d.ts
+++ b/api/@ohos.util.ArrayList.d.ts
@@ -40,7 +40,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class ArrayList<T> {
   /**
@@ -59,13 +60,14 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * A constructor used to create an ArrayList instance.
+   * A constructor used to create a ArrayList object.
    *
    * @throws { BusinessError } 10200012 - The ArrayList's constructor cannot be directly invoked.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   constructor();
   /**
@@ -84,7 +86,7 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Number of elements in an array list.
+   * Gets the element number of the ArrayList.This is a number one higher than the highest index in the arraylist.
    *
    * @type { number }
    * @syscap SystemCapability.Utils.Lang
@@ -93,6 +95,17 @@ declare class ArrayList<T> {
    * @since 12
    */
   length: number;
+  /**
+   * Gets the element number of the ArrayList.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
   /**
    * Appends the specified element to the end of this arraylist.
    *
@@ -113,15 +126,16 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Adds an element at the end of this container.
+   * Appends the specified element to the end of this arraylist.
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element to be appended to this arraylist
    * @returns { boolean } the boolean type, returns true if the addition is successful, and returns false if it fails.
    * @throws { BusinessError } 10200011 - The add method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   add(element: T): boolean;
   /**
@@ -158,10 +172,12 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Inserts an element at the specified position in this container.
+   * Inserts the specified element at the specified position in this
+   * arraylist. Shifts the element currently at that position (if any) and
+   * any subsequent elements to the right (adds one to their index).
    *
-   * @param { T } element - Target element.
-   * @param { number } index - Index of the position where the element is to be inserted.
+   * @param { T } element - element element element to be inserted
+   * @param { number } index - index index at which the specified element is to be inserted
    * @throws { BusinessError } 10200001 - The value of index is out of range.
    * @throws { BusinessError } 10200011 - The insert method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
@@ -171,7 +187,8 @@ declare class ArrayList<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   insert(element: T, index: number): void;
   /**
@@ -194,15 +211,16 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Checks whether this container has the specified element.
+   * Check if arraylist contains the specified element
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to be contained
    * @returns { boolean } the boolean type,if arraylist contains the specified element,return true,else return false
    * @throws { BusinessError } 10200011 - The has method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   has(element: T): boolean;
   /**
@@ -227,15 +245,17 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Obtains the index of the first occurrence of the specified element in this container.
+   * Returns the index of the first occurrence of the specified element
+   * in this arraylist, or -1 if this arraylist does not contain the element.
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to be contained
    * @returns { number } the number type ,returns the lowest index such that or -1 if there is no such index.
    * @throws { BusinessError } 10200011 - The getIndexOf method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getIndexOf(element: T): number;
   /**
@@ -270,11 +290,12 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Removes an element with the specified position from this container.
+   * Find the corresponding element according to the index,
+   * delete the element, and move the index of all elements to the right of the element forward by one.
    *
-   * @param { number } index - Position index of the target element.
-   * @returns { T } Element removed.
-   * @throws { BusinessError } 10200001 - The value of index is out of range.
+   * @param { number } index - index index the index in the arraylist
+   * @returns { T } the T type ,returns undefined if arraylist is empty,If the index is
+   * @throws { BusinessError } 10200001 - The value of "index" is out of range.
    * @throws { BusinessError } 10200011 - The removeByIndex method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -283,7 +304,8 @@ declare class ArrayList<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   removeByIndex(index: number): T;
   /**
@@ -310,15 +332,18 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Removes the first occurrence of the specified element from this container.
+   * Removes the first occurrence of the specified element from this arraylist,
+   * if it is present.  If the arraylist does not contain the element, it is
+   * unchanged.  More formally, removes the element with the lowest index
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to remove
    * @returns { boolean } the boolean type ,If there is no such element, return false
    * @throws { BusinessError } 10200011 - The remove method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   remove(element: T): boolean;
   /**
@@ -343,15 +368,17 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Obtains the index of the last occurrence of the specified element in this container.
+   * Returns in the index of the last occurrence of the specified element in this arraylist ,
+   * or -1 if the arraylist does not contain the element.
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to find
    * @returns { number } the number type
    * @throws { BusinessError } 10200011 - The getLastIndexOf method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getLastIndexOf(element: T): number;
   /**
@@ -384,11 +411,10 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Removes from this container all of the elements within a range, including the element at the start position but
-   * not that at the end position.
+   * Removes from this arraylist all of the elements whose index is between fromIndex,inclusive,and toIndex ,exclusive.
    *
-   * @param { number } fromIndex - Index of the start position.
-   * @param { number } toIndex - Index of the end position.
+   * @param { number } fromIndex - fromIndex fromIndex The starting position of the index, containing the value at that index position
+   * @param { number } toIndex - toIndex toIndex the end of the index, excluding the value at that index
    * @throws { BusinessError } 10200001 - The value of fromIndex or toIndex is out of range.
    * @throws { BusinessError } 10200011 - The removeByRange method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
@@ -398,7 +424,8 @@ declare class ArrayList<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   removeByRange(fromIndex: number, toIndex: number): void;
   /**
@@ -435,10 +462,14 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Replaces all elements in this container with new elements, and returns the new ones.
+   * Replaces each element of this arraylist with the result of applying the operator to that element.
    *
-   * @param { function } callbackFn - Callback invoked for the replacement.
-   * @param { Object } [thisArg] - Value of this to use when callbackFn is invoked. The default value is this instance.
+   * @param { function } callbackFn - callbackFn
+   * callbackFn (required) A function that accepts up to three arguments.
+   * The function to be called for each element.
+   * @param { Object } [thisArg] - thisArg
+   * thisArg (Optional) The value to be used as this value for when callbackFn is called.
+   * If thisArg is omitted, undefined is used as the this value.
    * @throws { BusinessError } 10200011 - The replaceAllElements method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -449,6 +480,19 @@ declare class ArrayList<T> {
    * @since 12
    */
   replaceAllElements(callbackFn: (value: T, index?: number, arrlist?: ArrayList<T>) => T, thisArg?: Object): void;
+
+  /**
+   * Replaces each element of this arrayList with the result of applying the operator to that element.
+   *
+   * @param { ArrayListCbFn1<T> } callbackFn - A callback function to execute for each element.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  replaceAllElements(callbackFn: ArrayListCbFn1<T>): void;
+
   /**
    * Executes a provided function once for each value in the arraylist object.
    *
@@ -483,10 +527,14 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Uses a callback to traverse the elements in this container and obtain their position indexes.
+   * Executes a provided function once for each value in the arraylist object.
    *
-   * @param { function } callbackFn - Callback invoked for the replacement.
-   * @param { Object } [thisArg] - 	Value of this to use when callbackFn is invoked. The default value is this instance.
+   * @param { function } callbackFn - callbackFn
+   * callbackFn (required) A function that accepts up to three arguments.
+   * The function to be called for each element.
+   * @param { Object } [thisArg] - thisArg
+   * thisArg (Optional) The value to be used as this value for when callbackFn is called.
+   * If thisArg is omitted, undefined is used as the this value.
    * @throws { BusinessError } 10200011 - The forEach method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -497,6 +545,19 @@ declare class ArrayList<T> {
    * @since 12
    */
   forEach(callbackFn: (value: T, index?: number, arrlist?: ArrayList<T>) => void, thisArg?: Object): void;
+
+  /**
+   * Iterates over elements in a generic ArrayList and executes a callback function for each element.
+   *
+   * @param { ArrayListCbFn<T> } callbackFn - A callback function to execute for each element.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackFn: ArrayListCbFn<T>): void;
+
   /**
    * Sorts this arraylist according to the order induced by the specified comparator,without comparator this parameter,
    * it will default to ASCII sorting
@@ -531,10 +592,14 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Sorts elements in this container.
+   * Sorts this arraylist according to the order induced by the specified comparator,without comparator this parameter,
+   * it will default to ASCII sorting
    *
-   * @param { function } [comparator] - Callback invoked for sorting. The default value is the callback function for
-   * sorting elements in ascending order.
+   * @param { function } [comparator] - comparator
+   * comparator (Optional) A function that accepts up to two arguments.Specifies the sort order.
+   * Must be a function,return number type,If it returns firstValue minus secondValue, it returns an arraylist
+   * sorted in ascending order;If it returns secondValue minus firstValue, it returns an arraylist sorted in descending order;
+   * If this parameter is empty, it will default to ASCII sorting
    * @throws { BusinessError } 10200011 - The sort method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Incorrect parameter types;
@@ -542,7 +607,8 @@ declare class ArrayList<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   sort(comparator?: (firstValue: T, secondValue: T) => number): void;
   /**
@@ -577,12 +643,11 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Obtains elements within a range in this container, including the element at the start position but not that at the
-   * end position, and returns these elements as a new ArrayList instance.
+   * Returns a view of the portion of this arraylist between the specified fromIndex,inclusive,and toIndex,exclusive
    *
-   * @param { number } fromIndex - Index of the start position.
-   * @param { number } toIndex - Index of the end position.
-   * @returns { ArrayList<T> } New ArrayList instance obtained.
+   * @param { number } fromIndex - fromIndex fromIndex The starting position of the index, containing the value at that index position
+   * @param { number } toIndex - toIndex toIndex the end of the index, excluding the value at that index
+   * @returns { ArrayList<T> }
    * @throws { BusinessError } 10200001 - The value of fromIndex or toIndex is out of range.
    * @throws { BusinessError } 10200011 - The subArrayList method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
@@ -592,7 +657,8 @@ declare class ArrayList<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   subArrayList(fromIndex: number, toIndex: number): ArrayList<T>;
   /**
@@ -613,13 +679,15 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Clears this container and sets its length to 0.
+   * Removes all of the elements from this arraylist.The arraylist will
+   * be empty after this call returns.length becomes 0
    *
    * @throws { BusinessError } 10200011 - The clear method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clear(): void;
   /**
@@ -640,14 +708,15 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Clones this container and returns a copy. The modification to the copy does not affect the original instance.
+   * Returns a shallow copy of this instance. (The elements themselves are not copied.)
    *
    * @returns { ArrayList<T> } this arraylist instance
    * @throws { BusinessError } 10200011 - The clone method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clone(): ArrayList<T>;
   /**
@@ -668,14 +737,15 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Obtains the capacity of this container.
+   * returns the capacity of this arraylist
    *
    * @returns { number } the number type
    * @throws { BusinessError } 10200011 - The getCapacity method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getCapacity(): number;
   /**
@@ -696,14 +766,15 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Converts this container into an array.
+   * convert arraylist to array
    *
    * @returns { Array<T> } the Array type
    * @throws { BusinessError } 10200011 - The convertToArray method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   convertToArray(): Array<T>;
   /**
@@ -724,20 +795,22 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Checks whether this container is empty (contains no element).
+   * Determine whether arraylist is empty and whether there is an element
    *
    * @returns { boolean } Returns true if the container is empty; returns false otherwise.
    * @throws { BusinessError } 10200011 - The isEmpty method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   isEmpty(): boolean;
   /**
-   * Returns the element at the given index.
+   * Returns the item at that index.
    * 
-   * @param { number } index - Index. The value must be less than or equal to int32_max, that is, 2147483647.
+   * @param { number } index - The zero-based index of the desired code unit.
+   *     Throws error if index < 0 or index >= arraylist.length.
    * @returns { T } The element in the arraylist matching the given index. 
    * @throws { BusinessError } 401 - Parameter error.
    * @throws { BusinessError } 10200001 - The value of index is out of range.
@@ -746,6 +819,33 @@ declare class ArrayList<T> {
    * @since 12
    */
   [index: number]: T;
+
+  /**
+   * Returns the item at that index.
+   * 
+   * @param { number } index - The zero-based index of the desired code unit.
+   * @returns { T } The element in the arrayList matching the given index.
+   * @throws { BusinessError } 10200001 - The value of index is out of range.
+   * @syscap SystemCapability.Utils.Lang
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_get(index: number): T;
+
+  /**
+   * Set the value of item at that index.
+   *
+   * @param { number } index - The index of the element to set.
+   * @param { T } value - The value to set at the specified index.
+   * @throws { BusinessError } 10200001 - The value of index is out of range.
+   * @syscap SystemCapability.Utils.Lang
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_set(index: number, value: T): void;
+
   /**
    * If the newCapacity provided by the user is greater than or equal to length,
    * change the capacity of the arraylist to newCapacity, otherwise the capacity will not be changed
@@ -772,9 +872,10 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Increases the capacity of this container.
+   * If the newCapacity provided by the user is greater than or equal to length,
+   * change the capacity of the arraylist to newCapacity, otherwise the capacity will not be changed
    *
-   * @param { number } newCapacity - New capacity.
+   * @param { number } newCapacity - newCapacity newCapacity
    * @throws { BusinessError } 10200011 - The increaseCapacityTo method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -782,7 +883,8 @@ declare class ArrayList<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   increaseCapacityTo(newCapacity: number): void;
   /**
@@ -801,14 +903,14 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Releases the reserved space in this container by adjusting the container capacity to the actual number of elements
-   * in this container.
+   * Limit the capacity to the current length
    *
    * @throws { BusinessError } 10200011 - The trimToCurrentLength method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   trimToCurrentLength(): void;
   /**
@@ -829,7 +931,7 @@ declare class ArrayList<T> {
    * @since 10
    */
   /**
-   * Obtains an iterator, each item of which is a JavaScript object.
+   * returns an iterator.Each item of the iterator is a Javascript Object
    *
    * @returns { IterableIterator<T> }
    * @throws { BusinessError } 10200011 - The Symbol.iterator method cannot be bound.
@@ -839,6 +941,48 @@ declare class ArrayList<T> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<T>;
+
+  /**
+   * Returns an iterator. Each item of the iterator is a ArkTS Object
+   *
+   * @returns { IterableIterator<T> }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<T>;
 }
 
+  /**
+   * The type of ArrayList callback function.
+   *
+   * @typedef { function } ArrayListCbFn
+   * @param { T } value - The current element being processed
+   * @param { number } index - The index of the current element
+   * @param { ArrayList<T> } arrlist - The ArrayList instance being traversed
+   * @returns { void } This callback does not return a value
+   * @syscap SystemCapability.Utils.Lang
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  type ArrayListCbFn<T> =  (value: T, index: number, arrlist: ArrayList<T>) => void;
+
+  /**
+   * The type of ArrayList callback function.
+   *
+   * @typedef { function } ArrayListCbFn
+   * @param { T } value - The current element being processed
+   * @param { number } index - The index of the current element
+   * @param { ArrayList<T> } arrlist - The ArrayList instance being traversed
+   * @returns { T } This callback does not return a value
+   * @syscap SystemCapability.Utils.Lang
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  type ArrayListCbFn1<T> =  (value: T, index?: number, arrlist?: ArrayList<T>) => T;  
+
 export default ArrayList;
diff --git a/api/@ohos.util.Deque.d.ts b/api/@ohos.util.Deque.d.ts
index 9eb396a3fc85896bb907aa2bf6f33b1a5236128a..8e4758b126ebe044d827f4c34ffd5d1fa807989f 100644
--- a/api/@ohos.util.Deque.d.ts
+++ b/api/@ohos.util.Deque.d.ts
@@ -43,7 +43,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class Deque<T> {
   /**
@@ -68,7 +69,8 @@ declare class Deque<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   constructor();
   /**
@@ -96,6 +98,17 @@ declare class Deque<T> {
    * @since 12
    */
   length: number;
+    /**
+   * Gets the element number of the Deque.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
   /**
    * Inserts an element into the deque header.
    *
@@ -121,7 +134,8 @@ declare class Deque<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   insertFront(element: T): void;
   /**
@@ -149,7 +163,8 @@ declare class Deque<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   insertEnd(element: T): void;
   /**
@@ -180,7 +195,8 @@ declare class Deque<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   has(element: T): boolean;
   /**
@@ -211,6 +227,19 @@ declare class Deque<T> {
    * @since 12
    */
   getFirst(): T;
+
+  /**
+   * Obtains the header element of a deque.
+   *
+   * @returns { T | undefined } the first element of the deque if it exists, otherwise returns undefined.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getFirst(): T | undefined;
+
   /**
    * Obtains the end element of a deque.
    *
@@ -239,6 +268,19 @@ declare class Deque<T> {
    * @since 12
    */
   getLast(): T;
+
+  /**
+   * Obtains the end element of a deque.
+   *
+   * @returns { T | undefined } the last element of the deque if it exists, otherwise returns undefined.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getLast(): T | undefined;
+
   /**
    * Obtains the header element of a deque and delete the element.
    *
@@ -267,6 +309,19 @@ declare class Deque<T> {
    * @since 12
    */
   popFirst(): T;
+
+  /**
+   * Obtains the header element of a deque and delete the element.
+   *
+   * @returns { T | undefined } the deleted element of the deque if it exists, otherwise returns undefined.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  popFirst(): T | undefined;
+
   /**
    * Obtains the end element of a deque and delete the element.
    *
@@ -295,6 +350,19 @@ declare class Deque<T> {
    * @since 12
    */
   popLast(): T;
+
+  /**
+   * Obtains the end element of a deque and delete the element.
+   *
+   * @returns { T | undefined } the deleted element of the deque if it exists, otherwise returns undefined.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  popLast(): T | undefined;
+
   /**
    * Executes a provided function once for each value in the deque object.
    *
@@ -347,6 +415,44 @@ declare class Deque<T> {
    * @since 12
    */
   forEach(callbackFn: (value: T, index?: number, deque?: Deque<T>) => void, thisArg?: Object): void;
+
+  /**
+   * Iterates over elements in a generic Deque (double-ended queue) and executes a callback function for each element.
+   *
+   * @param { DequeCbFnforEach<T> } callbackFn - A callback function to execute for each element.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackFn: DequeCbFnforEach<T>): void;
+  /**
+   * Returns the byte at the specified index.
+   *
+   * @param { number } index - The zero-based index of the desired code unit.
+   * @returns { T } The element in the deque matching the given index.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_get(index: number): T;
+
+  /**
+   * Sets the byte at the specified index.
+   *
+   * @param { number } index – The index of the element to set.
+   * @param { T } value – The value to set at the specified index.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_set(index: number, value: T): void;
+
   /**
    * returns an iterator.Each item of the iterator is a Javascript Object
    *
@@ -375,6 +481,33 @@ declare class Deque<T> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<T>;
+
+  /**
+   * Returns an iterator. Each item of the iterator is a ArkTS Object
+   *
+   * @returns { IterableIterator<T> }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<T>;
 }
 
+  /**
+   * The type of Deque forEach callback function.
+   *
+   * @typedef { function } DequeCbFnforEach
+   * @param { T } value - The current element being processed
+   * @param { number } index - The index of the current element
+   * @param { Deque<T> } deque - The Deque instance being traversed
+   * @returns { void } This callback does not return a value
+   * @syscap SystemCapability.Utils.Lang
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  type DequeCbFnforEach<T> = (value: T, index: number, deque: Deque<T>) => void;
+
 export default Deque;
diff --git a/api/@ohos.util.HashMap.d.ts b/api/@ohos.util.HashMap.d.ts
index d15b1bd7a0b4a37cacf6e11c56949979ae13d990..7ade3272fd8cad35b3691c6bc958b37f44454bb1 100644
--- a/api/@ohos.util.HashMap.d.ts
+++ b/api/@ohos.util.HashMap.d.ts
@@ -40,7 +40,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class HashMap<K, V> {
   /**
@@ -59,13 +60,14 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * A constructor used to create a HashMap instance.
+   * A constructor used to create a HashMap object.
    *
    * @throws { BusinessError } 10200012 - The HashMap's constructor cannot be directly invoked.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   constructor();
   /**
@@ -84,7 +86,7 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Number of elements in a hash map.
+   * Gets the element number of the hashmap.
    *
    * @type { number }
    * @syscap SystemCapability.Utils.Lang
@@ -93,6 +95,17 @@ declare class HashMap<K, V> {
    * @since 12
    */
   length: number;
+    /**
+   * Gets the element number of the HashMap.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
   /**
    * Returns whether the Map object contains elements
    *
@@ -111,14 +124,15 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Checks whether this container is empty (contains no element).
+   * Returns whether the Map object contains elements
    *
    * @returns { boolean } the boolean type
    * @throws { BusinessError } 10200011 - The isEmpty method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   isEmpty(): boolean;
   /**
@@ -141,15 +155,16 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Checks whether this container contains the specified key.
+   * Returns whether a key is contained in this map
    *
-   * @param { K } key - Target key.
+   * @param { K } key - key key need to determine whether to include the key
    * @returns { boolean } the boolean type
    * @throws { BusinessError } 10200011 - The hasKey method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   hasKey(key: K): boolean;
   /**
@@ -172,15 +187,16 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Checks whether this container contains the specified value.
+   * Returns whether a value is contained in this map
    *
-   * @param { V } value - Target value.
+   * @param { V } value - value value need to determine whether to include the value
    * @returns { boolean } the boolean type
    * @throws { BusinessError } 10200011 - The hasValue method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   hasValue(value: V): boolean;
   /**
@@ -203,9 +219,9 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Obtains the value of the specified key in this container. If nothing is obtained, undefined is returned.
+   * Returns a specified element in a Map object, or undefined if there is no corresponding element
    *
-   * @param { K } key - Target key.
+   * @param { K } key - key key the index in HashMap
    * @returns { V } value or undefined
    * @throws { BusinessError } 10200011 - The get method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
@@ -214,6 +230,20 @@ declare class HashMap<K, V> {
    * @since 12
    */
   get(key: K): V;
+
+  /**
+   * Returns a specified element in a Map object, or undefined if there is no corresponding element
+   *
+   * @param { K } key - key key the index in HashMap
+   * @returns { V | undefined } value or undefined
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get(key: K): V | undefined;
+
   /**
    * Adds all element groups in one map to another map
    *
@@ -238,9 +268,9 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Adds all elements in a HashMap instance to this container.
+   * Adds all element groups in one map to another map
    *
-   * @param { HashMap<K, V> } map - HashMap instance whose elements are to be added to the current container.
+   * @param { HashMap<K, V> } map - map map the Map object to add members
    * @throws { BusinessError } 10200011 - The setAll method cannot be bound.
    * @throws { BusinessError } 401 -  Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -248,7 +278,8 @@ declare class HashMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   setAll(map: HashMap<K, V>): void;
   /**
@@ -277,10 +308,10 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Adds or updates an element in this container.
+   * Adds or updates a(new) key-value pair with a key and value specified for the Map object
    *
-   * @param { K } key - Key of the target element.
-   * @param { V } value - Value of the target element.
+   * @param { K } key - key key Added or updated targets
+   * @param { V } value - value value Added or updated value
    * @returns { Object } the map object after set
    * @throws { BusinessError } 10200011 - The set method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
@@ -288,7 +319,8 @@ declare class HashMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   set(key: K, value: V): Object;
   /**
@@ -311,9 +343,9 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Removes an element with the specified key from this container.
+   * Remove a specified element from a Map object
    *
-   * @param { K } key - Key of the target element.
+   * @param { K } key - key key Target to be deleted
    * @returns { V } Target mapped value
    * @throws { BusinessError } 10200011 - The remove method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
@@ -322,6 +354,20 @@ declare class HashMap<K, V> {
    * @since 12
    */
   remove(key: K): V;
+
+  /**
+   * Remove a specified element from a Map object
+   *
+   * @param { K } key - key key Target to be deleted
+   * @returns { V | undefined } Tthe value associated with the key if it was removed, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  remove(key: K): V | undefined;
+
   /**
    * Clear all element groups in the map
    *
@@ -338,13 +384,14 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Clears this container and sets its length to 0.
+   * Clear all element groups in the map
    *
    * @throws { BusinessError } 10200011 - The clear method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clear(): void;
   /**
@@ -365,14 +412,15 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Obtains an iterator that contains all the keys in this container.
+   * Returns a new Iterator object that contains the keys contained in this map
    *
    * @returns { IterableIterator<K> }
    * @throws { BusinessError } 10200011 - The keys method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   keys(): IterableIterator<K>;
   /**
@@ -393,14 +441,15 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Obtains an iterator that contains all the values in this container.
+   * Returns a new Iterator object that contains the values contained in this map
    *
    * @returns { IterableIterator<V> }
    * @throws { BusinessError } 10200011 - The values method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   values(): IterableIterator<V>;
   /**
@@ -425,16 +474,17 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Replaces an element in this container.
+   * Replace the old value by new value corresponding to the specified key
    *
-   * @param { K } key - Key of the target element.
-   * @param { V } newValue - New value of the element.
+   * @param { K } key - key key Updated targets
+   * @param { V } newValue - newValue newValue Updated the target mapped value
    * @returns { boolean } the boolean type(Is there a target pointed to by the key)
    * @throws { BusinessError } 10200011 - The replace method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   replace(key: K, newValue: V): boolean;
   /**
@@ -473,10 +523,15 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Uses a callback to traverse the elements in this container and obtain their position indexes.
+   * Executes the given callback function once for each real key in the map.
+   * It does not perform functions on deleted keys
    *
-   * @param { function } callbackFn - Callback invoked to traverse the elements in the container.
-   * @param { Object } [thisArg] - Value of this to use when callbackFn is invoked. The default value is this instance.
+   * @param { function } callbackFn - callbackFn
+   * callbackFn (required) A function that accepts up to three arguments.
+   * The function to be called for each element.
+   * @param { Object } [thisArg] - thisArg
+   * thisArg (Optional) The value to be used as this value for when callbackFn is called.
+   * If thisArg is omitted, undefined is used as the this value.
    * @throws { BusinessError } 10200011 - The forEach method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -487,6 +542,19 @@ declare class HashMap<K, V> {
    * @since 12
    */
   forEach(callbackFn: (value?: V, key?: K, map?: HashMap<K, V>) => void, thisArg?: Object): void;
+
+  /**
+   * Iterates over all key-value pairs in the HashMap and executes a callback function for each entry.
+   *
+   * @param { HashMapCbFn<K, V> } callbackFn - A callback function to execute for each key-value pair.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackFn: HashMapCbFn<K, V>): void;
+
   /**
    * Returns a new Iterator object that contains the [key, value] pairs for each element in the Map object in insertion order
    *
@@ -505,14 +573,15 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Obtains an iterator that contains all the elements in this container.
+   * Returns a new Iterator object that contains the [key, value] pairs for each element in the Map object in insertion order
    *
    * @returns { IterableIterator<[K, V]> }
    * @throws { BusinessError } 10200011 - The entries method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   entries(): IterableIterator<[K, V]>;
   /**
@@ -533,7 +602,7 @@ declare class HashMap<K, V> {
    * @since 10
    */
   /**
-   * Obtains an iterator, each item of which is a JavaScript object.
+   * returns an iterator.Each item of the iterator is a Javascript Object
    *
    * @returns { IterableIterator<[K, V]> }
    * @throws { BusinessError } 10200011 - The Symbol.iterator method cannot be bound.
@@ -543,6 +612,33 @@ declare class HashMap<K, V> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<[K, V]>;
+
+  /**
+   * returns an iterator.Each item of the iterator is a Javascript Object
+   *
+   * @returns { IterableIterator<[K, V]> } an iterator for the HashMap
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<[K, V]>;
 }
 
+  /**
+   * The type of HashMap callback function.
+   *
+   * @typedef { function } HashMapCbFn
+   * @param { V } value - The value of the current entry
+   * @param { K } key - The key of the current entry
+   * @param { HashMap<K, V> } map - The HashMap instance being traversed
+   * @returns { void } This callback does not return a value
+   * @syscap SystemCapability.Utils.Lang
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  type HashMapCbFn<K, V> = (value: V, key: K, map: HashMap<K, V>) => void;
+
 export default HashMap;
diff --git a/api/@ohos.util.HashSet.d.ts b/api/@ohos.util.HashSet.d.ts
index 7d86579d11838cf3a6b489d0dc1ed2520d33bdbb..654a6e7c8f42d6b1915096ee33811be6f1711005 100644
--- a/api/@ohos.util.HashSet.d.ts
+++ b/api/@ohos.util.HashSet.d.ts
@@ -37,7 +37,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class HashSet<T> {
   /**
@@ -62,7 +63,8 @@ declare class HashSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   constructor();
   /**
@@ -90,6 +92,17 @@ declare class HashSet<T> {
    * @since 12
    */
   length: number;
+    /**
+   * Gets the element number of the HashSet.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
   /**
    * Returns whether the Set object contains elements
    *
@@ -115,7 +128,8 @@ declare class HashSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   isEmpty(): boolean;
   /**
@@ -158,7 +172,8 @@ declare class HashSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   has(value: T): boolean;
   /**
@@ -201,7 +216,8 @@ declare class HashSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   add(value: T): boolean;
   /**
@@ -244,7 +260,8 @@ declare class HashSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   remove(value: T): boolean;
   /**
@@ -269,7 +286,8 @@ declare class HashSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clear(): void;
   /**
@@ -324,6 +342,19 @@ declare class HashSet<T> {
    * @since 12
    */
   forEach(callbackFn: (value?: T, key?: T, set?: HashSet<T>) => void, thisArg?: Object): void;
+
+  /**
+   * Iterates over all elements in the HashSet and executes a callback function for each element.
+   *
+   * @param { HashSetCbFn<T> } callbackFn - A callback function to execute for each element.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackFn: HashSetCbFn<T>): void;
+
   /**
    * Returns a new Iterator object that contains the values contained in this set
    *
@@ -349,7 +380,8 @@ declare class HashSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   values(): IterableIterator<T>;
   /**
@@ -377,7 +409,8 @@ declare class HashSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   entries(): IterableIterator<[T, T]>;
   /**
@@ -408,6 +441,33 @@ declare class HashSet<T> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<T>;
+
+  /**
+   * returns an iterator.Each item of the iterator is a Javascript Object
+   *
+   * @returns { IterableIterator<T> } an iterator for the HashSet
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<T>;
 }
 
+/**
+ * The type of HashSet callback function.
+ *
+ * @typedef { function } HashSetCbFn
+ * @param { T } value - The current element being processed
+ * @param { T } key - [Deprecated] HashSet does not use key-value pairs, this parameter exists only for API compatibility
+ * @param { HashSet<T> } set - The HashSet instance being traversed
+ * @returns { void } This callback does not return a value
+ * @syscap SystemCapability.Utils.Lang
+ * @atomicservice
+ * @since 20
+ * @arkts 1.2
+ */
+type HashSetCbFn<T> = (value: T, key: T, set: HashSet<T>) => void;
+
 export default HashSet;
diff --git a/api/@ohos.util.LightWeightMap.d.ts b/api/@ohos.util.LightWeightMap.d.ts
index 64c50f29dfb32de8482c9a3d443ba75c54b864d4..20cca18d68b8ae32852ddcd646a68a083cce6314 100644
--- a/api/@ohos.util.LightWeightMap.d.ts
+++ b/api/@ohos.util.LightWeightMap.d.ts
@@ -37,7 +37,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class LightWeightMap<K, V> {
   /**
@@ -62,7 +63,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   constructor();
   /**
@@ -90,6 +92,17 @@ declare class LightWeightMap<K, V> {
    * @since 12
    */
   length: number;
+    /**
+   * Gets the element number of the LightWeightMap.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
   /**
    * Returns whether this map has all the object in a specified map
    *
@@ -127,7 +140,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   hasAll(map: LightWeightMap<K, V>): boolean;
   /**
@@ -158,7 +172,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   hasKey(key: K): boolean;
   /**
@@ -189,7 +204,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   hasValue(value: V): boolean;
   /**
@@ -229,7 +245,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   increaseCapacityTo(minimumCapacity: number): void;
   /**
@@ -257,7 +274,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   entries(): IterableIterator<[K, V]>;
   /**
@@ -291,6 +309,20 @@ declare class LightWeightMap<K, V> {
    * @since 12
    */
   get(key: K): V;
+
+  /**
+   * Returns the value to which the specified key is mapped, or undefined if this map contains no mapping for the key
+   *
+   * @param { K } key - key key the index in LightWeightMap
+   * @returns { V | undefined } value if associated with key presents, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get(key: K): V | undefined;
+
   /**
    * Obtains the index of the key equal to a specified key in an LightWeightMap container
    *
@@ -319,7 +351,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getIndexOfKey(key: K): number;
   /**
@@ -350,7 +383,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getIndexOfValue(value: V): number;
   /**
@@ -378,7 +412,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   isEmpty(): boolean;
   /**
@@ -424,7 +459,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getKeyAt(index: number): K;
   /**
@@ -452,7 +488,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   keys(): IterableIterator<K>;
   /**
@@ -489,7 +526,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   setAll(map: LightWeightMap<K, V>): void;
   /**
@@ -523,7 +561,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   set(key: K, value: V): Object;
   /**
@@ -557,6 +596,20 @@ declare class LightWeightMap<K, V> {
    * @since 12
    */
   remove(key: K): V;
+
+  /**
+   * Remove the mapping for this key from this map if present
+   *
+   * @param { K } key - key key Target to be deleted
+   * @returns { V | undefined } the value associated with the key if it was removed, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  remove(key: K): V | undefined;
+
   /**
    * Deletes a key-value pair at the location identified by index from an LightWeightMap container
    *
@@ -594,7 +647,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   removeAt(index: number): boolean;
   /**
@@ -622,7 +676,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clear(): void;
   /**
@@ -671,7 +726,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   setValueAt(index: number, newValue: V): boolean;
   /**
@@ -729,6 +785,19 @@ declare class LightWeightMap<K, V> {
    * @since 12
    */
   forEach(callbackFn: (value?: V, key?: K, map?: LightWeightMap<K, V>) => void, thisArg?: Object): void;
+
+  /**
+   * Iterates over all key-value pairs in the LightWeightMap and executes a callback function for each entry.
+   * 
+   * @param { LightWeightMapCbFn<K, V> } callbackFn - A callback function that will be executed for each key-value pair.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackFn: LightWeightMapCbFn<K, V>): void;
+
   /**
    * returns an ES6 iterator.Each item of the iterator is a Javascript Object
    *
@@ -757,6 +826,19 @@ declare class LightWeightMap<K, V> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<[K, V]>;
+
+  /**
+   * returns an ES6 iterator.Each item of the iterator is a Javascript Object
+   *
+   * @returns { IterableIterator<[K, V]> } an iterator for the LightWeightMap
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<[K, V]>;
+
   /**
    * Obtains a string that contains all the keys and values in an LightWeightMap container
    *
@@ -782,7 +864,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   toString(): String;
   /**
@@ -828,7 +911,8 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getValueAt(index: number): V;
   /**
@@ -856,9 +940,25 @@ declare class LightWeightMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   values(): IterableIterator<V>;
 }
 
+  /**
+   * The type of LightWeightMap callback function.
+   *
+   * @typedef { function } LightWeightMapCbFn
+   * @param { V } value - The value of the current entry
+   * @param { K } key - The key of the current entry
+   * @param { LightWeightMap<K, V> } map - The LightWeightMap instance being traversed
+   * @returns { void } This callback does not return a value
+   * @syscap SystemCapability.Utils.Lang
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  type LightWeightMapCbFn<K, V> = (value: V, key: K, map: LightWeightMap<K, V>) => void;
+
 export default LightWeightMap;
diff --git a/api/@ohos.util.LightWeightSet.d.ts b/api/@ohos.util.LightWeightSet.d.ts
index ffde49ae6751e5cf33a5430d7a2ebc83a4983da1..612b677db1d98cfa7662c04846177a593ce3bf91 100644
--- a/api/@ohos.util.LightWeightSet.d.ts
+++ b/api/@ohos.util.LightWeightSet.d.ts
@@ -37,7 +37,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class LightWeightSet<T> {
   /**
@@ -62,7 +63,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   constructor();
   /**
@@ -90,6 +92,19 @@ declare class LightWeightSet<T> {
    * @since 12
    */
   length: number;
+
+  /**
+   * Gets the element number of the LightWeightSet.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
+
   /**
    * If the set does not contain the element, the specified element is added
    *
@@ -118,7 +133,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   add(obj: T): boolean;
   /**
@@ -158,7 +174,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   addAll(set: LightWeightSet<T>): boolean;
   /**
@@ -198,7 +215,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   hasAll(set: LightWeightSet<T>): boolean;
   /**
@@ -229,7 +247,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   has(key: T): boolean;
   /**
@@ -296,7 +315,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   increaseCapacityTo(minimumCapacity: number): void;
   /**
@@ -327,7 +347,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getIndexOf(key: T): number;
   /**
@@ -361,6 +382,20 @@ declare class LightWeightSet<T> {
    * @since 12
    */
   remove(key: T): T;
+
+  /**
+   * Deletes an object of a specified Object type from an LightWeightSet container
+   *
+   * @param { T } key - key key Target to be deleted
+   * @returns { T | undefined } the removed value if it was present, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  remove(key: T): T | undefined;
+
   /**
    * Deletes an object at the location identified by index from an LightWeightSet container
    *
@@ -398,7 +433,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   removeAt(index: number): boolean;
   /**
@@ -426,7 +462,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clear(): void;
   /**
@@ -484,6 +521,20 @@ declare class LightWeightSet<T> {
    * @since 12
    */
   forEach(callbackFn: (value?: T, key?: T, set?: LightWeightSet<T>) => void, thisArg?: Object): void;
+
+  /**
+   * Executes the given callback function once for each real key in the map.
+   * It does not perform functions on deleted keys.
+   *
+   * @param { LightWeightSetForEachCb<T> } callbackFn - A callback function to execute for each element.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackFn: LightWeightSetForEachCb<T>): void;
+
   /**
    * returns an ES6 iterator.Each item of the iterator is a Javascript Object
    *
@@ -512,6 +563,19 @@ declare class LightWeightSet<T> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<T>;
+
+  /**
+   * returns an ES6 iterator.Each item of the iterator is a Javascript Object
+   *
+   * @returns { IterableIterator<T> } an iterator for the LightWeightSet
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<T>;
+
   /**
    * Obtains a string that contains all the keys and values in an LightWeightSet container
    *
@@ -534,7 +598,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   toString(): String;
   /**
@@ -562,7 +627,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   toArray(): Array<T>;
   /**
@@ -605,6 +671,20 @@ declare class LightWeightSet<T> {
    * @since 12
    */
   getValueAt(index: number): T;
+
+  /**
+   * Obtains the object at the location  identified by index in an LightWeightSet container
+   *
+   * @param { number } index - index index Target subscript for search
+   * @returns { T | undefined } the value at the specified index, or undefined if the index out of range
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getValueAt(index: number): T | undefined;
+
   /**
    * Returns a ES6 iterator of the values contained in this Set
    *
@@ -630,7 +710,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   values(): IterableIterator<T>;
   /**
@@ -658,7 +739,8 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   entries(): IterableIterator<[T, T]>;
   /**
@@ -686,9 +768,25 @@ declare class LightWeightSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   isEmpty(): boolean;
 }
 
+/**
+ * The type of LightWeightSet callback function.
+ *
+ * @typedef { function } LightWeightSetForEachCb
+ * @param { T } value - The value of current element
+ * @param { T } key - The key of current element(same as value)
+ * @param { LightWeightSet<T> } set - The LightWeightSet instance being traversed
+ * @returns { void } This callback does not return a value
+ * @syscap SystemCapability.Utils.Lang
+ * @atomicservice
+ * @since 20
+ * @arkts 1.2
+ */
+type LightWeightSetForEachCb<T> = (value: T, key: T, set: LightWeightSet<T>) => void
+
 export default LightWeightSet;
diff --git a/api/@ohos.util.LinkedList.d.ts b/api/@ohos.util.LinkedList.d.ts
index 3cb01b1dde057175c95c66f1759e022b4ffc826f..73ab126b6d1a40c7c0e6357ae99120d304a490c2 100644
--- a/api/@ohos.util.LinkedList.d.ts
+++ b/api/@ohos.util.LinkedList.d.ts
@@ -38,13 +38,13 @@
 /**
  * LinkedList is implemented based on the doubly linked list. Each node of the doubly linked list has
  * references pointing to the previous element and the next element. When querying an element,
- * the system traverses the list from the beginning or end. LinkedList offers efficient insertion and
- * removal operations but supports low query efficiency. LinkedList allows null elements.
+ * the system traverses the list from the beginning or end. 
  *
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class LinkedList<T> {
   /**
@@ -63,13 +63,14 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * A constructor used to create a LinkedList instance.
+   * A constructor used to create a LinkedList object.
    *
    * @throws { BusinessError } 10200012 - The LinkedList's constructor cannot be directly invoked.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   constructor();
   /**
@@ -88,7 +89,7 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Number of elements in a linked list.
+   * Gets the element number of the LinkedList. This is a number one higher than the highest index in the linkedlist.
    *
    * @type { number }
    * @syscap SystemCapability.Utils.Lang
@@ -97,6 +98,19 @@ declare class LinkedList<T> {
    * @since 12
    */
   length: number;
+
+    /**
+   * Gets the element number of the LinkedList.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
+
   /**
    * Appends the specified element to the end of this linkedlist.
    *
@@ -117,15 +131,16 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Adds an element at the end of this container.
+   * Appends the specified element to the end of this linkedlist.
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element to be appended to this linkedlist
    * @returns { boolean } the boolean type, returns true if the addition is successful, and returns false if it fails.
    * @throws { BusinessError } 10200011 - The add method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   add(element: T): boolean;
   /**
@@ -158,10 +173,10 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Inserts an element at the specified position in this container.
+   * Inserts the specified element at the specified position in this linkedlist.
    *
-   * @param { number } index - Index of the position where the element is to be inserted.
-   * @param { T } element - Target element.
+   * @param { number } index - index index index at which the specified element is to be inserted
+   * @param { T } element - element element element to be inserted
    * @throws { BusinessError } 10200011 - The insert method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -171,7 +186,8 @@ declare class LinkedList<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   insert(index: number, element: T): void;
   /**
@@ -202,9 +218,10 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Obtains an element at the specified position in this container.
+   * Returns the element at the specified position in this linkedlist,
+   * or returns undefined if this linkedlist is empty
    *
-   * @param { number } index - Position index of the target element.
+   * @param { number } index - index index specified position
    * @returns { T } the T type
    * @throws { BusinessError } 10200011 - The get method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
@@ -216,6 +233,21 @@ declare class LinkedList<T> {
    * @since 12
    */
   get(index: number): T;
+
+  /**
+   * Returns the element at the specified position in this linkedList,
+   * or returns undefined if this linkedList is empty
+   *
+   * @param { number } index - specified position
+   * @returns { T | undefined} the element at the specified index, or undefined if the index is out of range.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get(index: number): T | undefined;
+
   /**
    * Inserts the specified element at the beginning of this LinkedList.
    *
@@ -234,14 +266,15 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Adds an element at the top of this container.
+   * Inserts the specified element at the beginning of this LinkedList.
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element the element to add
    * @throws { BusinessError } 10200011 - The addFirst method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   addFirst(element: T): void;
   /**
@@ -264,7 +297,7 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Removes the first element from this container.
+   * Retrieves and removes the head (first element) of this linkedlist.
    *
    * @returns { T } Element removed.
    * @throws { BusinessError } 10200011 - The removeFirst method cannot be bound.
@@ -275,6 +308,20 @@ declare class LinkedList<T> {
    * @since 12
    */
   removeFirst(): T;
+
+  /**
+   * Retrieves and removes the head (first element) of this linkedList.
+   *
+   * @returns { T | undefined } the head of this list
+   * @throws { BusinessError } 10200010 - Container is empty.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  removeFirst(): T | undefined;
+
   /**
    * Removes and returns the last element from this linkedlist.
    *
@@ -295,7 +342,7 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Removes the last element from this container.
+   * Removes and returns the last element from this linkedlist.
    *
    * @returns { T } Element removed.
    * @throws { BusinessError } 10200011 - The removeLast method cannot be bound.
@@ -306,6 +353,20 @@ declare class LinkedList<T> {
    * @since 12
    */
   removeLast(): T;
+
+  /**
+   * Removes and returns the last element from this linkedList.
+   *
+   * @returns { T | undefined } the head of this list
+   * @throws { BusinessError } 10200010 - Container is empty.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  removeLast(): T | undefined;
+
   /**
    * Check if linkedlist contains the specified element
    *
@@ -326,15 +387,16 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Checks whether this container has the specified element.
+   * Check if linkedlist contains the specified element
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to be contained
    * @returns { boolean } the boolean type,if linkedList contains the specified element,return true,else return false
    * @throws { BusinessError } 10200011 - The has method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   has(element: T): boolean;
   /**
@@ -359,15 +421,17 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Obtains the index of the first occurrence of the specified element in this container.
+   * Returns the index of the first occurrence of the specified element
+   * in this linkedlist, or -1 if this linkedlist does not contain the element.
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to be contained
    * @returns { number } the number type ,returns the lowest index such that or -1 if there is no such index.
    * @throws { BusinessError } 10200011 - The getIndexOf method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getIndexOf(element: T): number;
   /**
@@ -402,9 +466,9 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Searches for an element based on its index and then removes it.
+   * Find the corresponding element according to the index.
    *
-   * @param { number } index - 	Position index of the target element.
+   * @param { number } index - index index the index in the linkedlist
    * @returns { T } the T type ,returns undefined if linkedlist is empty,If the index is
    * out of bounds (greater than or equal to length or less than 0), throw an exception
    * @throws { BusinessError } 10200011 - The removeByIndex method cannot be bound.
@@ -419,6 +483,23 @@ declare class LinkedList<T> {
    * @since 12
    */
   removeByIndex(index: number): T;
+
+  /**
+   * Find the corresponding element according to the index.
+   *
+   * @param { number } index - the index in the linkedList
+   * @returns { T | undefined } the T type, if the index is
+   * out of bounds (greater than or equal to length or less than 0), throw an exception
+   * @throws { BusinessError } 10200001 - The value of "index" is out of range. It must be >= 0 && <= ${length}.
+   * Received value is: ${index}
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  removeByIndex(index: number): T | undefined;
+
   /**
    * Removes the first occurrence of the specified element from this linkedlist,
    * if it is present.  If the linkedlist does not contain the element, it is
@@ -443,15 +524,18 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Removes the first occurrence of the specified element from this container.
+   * Removes the first occurrence of the specified element from this linkedlist,
+   * if it is present.  If the linkedlist does not contain the element, it is
+   * unchanged.  More formally, removes the element with the lowest index
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to remove
    * @returns { boolean } the boolean type ,If there is no such element, return false
    * @throws { BusinessError } 10200011 - The remove method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   remove(element: T): boolean;
   /**
@@ -482,9 +566,11 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Removes the first occurrence of the specified element from this container.
+   * Removes the first occurrence of the specified element from this linkedlist,
+   * if it is present.  If the linkedlist does not contain the element, it is
+   * unchanged.  More formally, removes the element with the lowest index
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to remove
    * @returns { boolean } the boolean type ,If there is no such element, return false
    * @throws { BusinessError } 10200011 - The removeFirstFound method cannot be bound.
    * @throws { BusinessError } 10200010 - Container is empty.
@@ -492,7 +578,8 @@ declare class LinkedList<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   removeFirstFound(element: T): boolean;
   /**
@@ -523,9 +610,11 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Removes the last occurrence of the specified element from this container.
+   * Removes the last occurrence of the specified element from this linkedlist,
+   * if it is present.  If the linkedlist does not contain the element, it is
+   * unchanged.  More formally, removes the element with the lowest index
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to remove
    * @returns { boolean } the boolean type ,If there is no such element, return false
    * @throws { BusinessError } 10200011 - The removeLastFound method cannot be bound.
    * @throws { BusinessError } 10200010 - Container is empty.
@@ -533,7 +622,8 @@ declare class LinkedList<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   removeLastFound(element: T): boolean;
   /**
@@ -558,15 +648,17 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Obtains the index of the last occurrence of the specified element in this container.
+   * Returns in the index of the last occurrence of the specified element in this linkedlist ,
+   * or -1 if the linkedlist does not contain the element.
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to find
    * @returns { number } the number type
    * @throws { BusinessError } 10200011 - The getLastIndexOf method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getLastIndexOf(element: T): number;
   /**
@@ -589,7 +681,8 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Obtains the first element in this container.
+   * Returns the first element (the item at index 0) of this linkedlist.
+   * or returns undefined if linkedlist is empty
    *
    * @returns { T } the T type ,returns undefined if linkedList is empty
    * @throws { BusinessError } 10200011 - The getFirst method cannot be bound.
@@ -599,6 +692,20 @@ declare class LinkedList<T> {
    * @since 12
    */
   getFirst(): T;
+
+  /**
+   * Returns the first element (the item at index 0) of this linkedList.
+   * or returns undefined if linkedList is empty
+   *
+   * @returns { T | undefined } the T type, returns undefined if linkedList is empty
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getFirst(): T | undefined;
+
   /**
    * Returns the Last element (the item at index length-1) of this linkedlist.
    * or returns undefined if linkedlist is empty
@@ -619,7 +726,8 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Obtains the last element in this container.
+   * Returns the Last element (the item at index length-1) of this linkedlist.
+   * or returns undefined if linkedlist is empty
    *
    * @returns { T } the T type ,returns undefined if linkedList is empty
    * @throws { BusinessError } 10200011 - The getLast method cannot be bound.
@@ -629,6 +737,20 @@ declare class LinkedList<T> {
    * @since 12
    */
   getLast(): T;
+
+  /**
+   * Returns the Last element (the item at index length - 1) of this linkedList.
+   * or returns undefined if linkedList is empty
+   *
+   * @returns { T | undefined } the T type, returns undefined if linkedList is empty
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getLast(): T | undefined;
+
   /**
    * Replaces the element at the specified position in this Vector with the specified element
    *
@@ -661,10 +783,10 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Replaces an element at the specified position in this container with a given element.
+   * Replaces the element at the specified position in this Vector with the specified element
    *
-   * @param { number } index - Position index of the target element.
-   * @param { T } element - Element to be used for replacement.
+   * @param { number } index - index index index to find
+   * @param { T } element - element element replaced element
    * @returns { T } the T type ,returns undefined if linkedList is empty
    * @throws { BusinessError } 10200011 - The set method cannot be bound.
    * @throws { BusinessError } 10200001 - The value of index is out of range.
@@ -678,6 +800,25 @@ declare class LinkedList<T> {
    * @since 12
    */
   set(index: number, element: T): T;
+
+  /**
+   * Replaces the element at the specified position in this Vector with the specified element
+   *
+   * @param { number } index - index index index to find
+   * @param { T } element - element element replaced element
+   * @returns { T | undefined } the T type ,returns undefined if linkedList is empty
+   * @throws { BusinessError } 10200001 - The value of index is out of range.
+   * 1.Mandatory parameters are left unspecified;
+   * 2.Incorrect parameter types;
+   * 3.Parameter verification failed.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  set(index: number, element: T): T | undefined;
+
   /**
    * Replaces each element of this linkedlist with the result of applying the operator to that element.
    *
@@ -718,10 +859,17 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Uses a callback to traverse the elements in this container and obtain their position indexes.
+   * Replaces each element of this linkedlist with the result of applying the operator to that element.
    *
-   * @param { function } callbackFn - Callback invoked to traverse the elements in the container.
-   * @param { Object } [thisArg] - Value of this to use when callbackFn is invoked. The default value is this instance.
+   * @param { function } callbackFn - callbackFn
+   * callbackFn (required) A function that accepts up to three arguments.
+   * The function to be called for each element.
+   * Value (required) current element
+   * Index (Optional) The index value of the current element.
+   * LinkedList (Optional) The linkedlist object to which the current element belongs.
+   * @param { Object } [thisArg] - thisArg
+   * thisArg (Optional) The value to be used as this value for when callbackFn is called.
+   * If thisArg is omitted, undefined is used as the this value.
    * @throws { BusinessError } 10200011 - The forEach method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -732,6 +880,19 @@ declare class LinkedList<T> {
    * @since 12
    */
   forEach(callbackFn: (value: T, index?: number, LinkedList?: LinkedList<T>) => void, thisArg?: Object): void;
+
+  /**
+   * Replaces each element of this linkedList with the result of applying the operator to that element.
+   *
+   * @param { LinkedListForEachCb } callbackFn - callbackFn
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackfn: LinkedListForEachCb<T>): void;
+
   /**
    * Removes all of the elements from this linkedlist.The linkedlist will
    * be empty after this call returns.length becomes 0
@@ -750,13 +911,15 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Clears this container and sets its length to 0.
+   * Removes all of the elements from this linkedlist.The linkedlist will
+   * be empty after this call returns.length becomes 0
    *
    * @throws { BusinessError } 10200011 - The clear method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clear(): void;
   /**
@@ -777,14 +940,15 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Clones this container and returns a copy. The modification to the copy does not affect the original instance.
+   * Returns a shallow copy of this instance. (The elements themselves are not copied.)
    *
    * @returns { LinkedList<T> } this linkedlist instance
    * @throws { BusinessError } 10200011 - The clone method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clone(): LinkedList<T>;
   /**
@@ -805,14 +969,15 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Converts this container into an array.
+   * convert linkedlist to array
    *
    * @returns { Array<T> } the Array type
    * @throws { BusinessError } 10200011 - The convertToArray method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   convertToArray(): Array<T>;
   /**
@@ -833,7 +998,7 @@ declare class LinkedList<T> {
    * @since 10
    */
   /**
-   * Obtains an iterator, each item of which is a JavaScript object.
+   * returns an iterator.Each item of the iterator is a Javascript Object
    *
    * @returns { IterableIterator<T> }
    * @throws { BusinessError } 10200011 - The Symbol.iterator method cannot be bound.
@@ -843,6 +1008,34 @@ declare class LinkedList<T> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<T>;
+
+  /**
+   * returns an iterator. Each item of the iterator is a ArkTS Object
+   *
+   * @returns { IterableIterator<T> }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<T>;
+
 }
 
+/**
+ * The type of LinkedList callback function.
+ *
+ * @typedef { function } LinkedListForEachCb
+ * @param { T } value - The value of current element
+ * @param { number } index - The index of current element
+ * @param { LinkedList<T> } linkedList - The LinkedList instance being traversed
+ * @returns { void } This callback does not return a value
+ * @syscap SystemCapability.Utils.Lang
+ * @atomicservice
+ * @since 20
+ * @arkts 1.2
+ */
+type LinkedListForEachCb<T> = (value: T, index: number, linkedList: LinkedList<T>) => void
+
 export default LinkedList;
diff --git a/api/@ohos.util.List.d.ts b/api/@ohos.util.List.d.ts
index 1834ca5678d8f5e9817d95c94b762d091bba9cf3..5967f7ce6c9db96aee26e5a8ab2ef4f2c6437873 100644
--- a/api/@ohos.util.List.d.ts
+++ b/api/@ohos.util.List.d.ts
@@ -35,13 +35,13 @@
  */
 /**
  * List is implemented based on the singly linked list. Each node has a reference pointing to the next element.
- * When querying an element, the system traverses the list from the beginning. List offers efficient insertion
- * and removal operations but supports low query efficiency. List allows null elements.
+ * When querying an element, the system traverses the list from the beginning.
  *
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class List<T> {
   /**
@@ -60,13 +60,14 @@ declare class List<T> {
    * @since 10
    */
   /**
-   *A constructor used to create a List instance.
+   * A constructor used to create a List object.
    *
    * @throws { BusinessError } 10200012 - The List's constructor cannot be directly invoked.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   constructor();
   /**
@@ -85,7 +86,7 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Number of elements in a list.
+   * Gets the element number of the List. This is a number one higher than the highest index in the list.
    *
    * @type { number }
    * @syscap SystemCapability.Utils.Lang
@@ -94,6 +95,19 @@ declare class List<T> {
    * @since 12
    */
   length: number;
+
+  /**
+   * Gets the element number of the List.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
+
   /**
    * Appends the specified element to the end of this list.
    *
@@ -114,15 +128,16 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Adds an element at the end of this container.
+   * Appends the specified element to the end of this list.
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element to be appended to this list
    * @returns { boolean } the boolean type, returns true if the addition is successful, and returns false if it fails.
    * @throws { BusinessError } 10200011 - The add method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   add(element: T): boolean;
   /**
@@ -155,10 +170,10 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Inserts an element at the specified position in this container.
+   * Inserts the specified element at the specified position in this list.
    *
-   * @param { T } element - Target element.
-   * @param { number } index - Index of the position where the element is to be inserted.
+   * @param { T } element - element element element to be inserted
+   * @param { number } index - index index index at which the specified element is to be inserted
    * @throws { BusinessError } 10200011 - The insert method cannot be bound.
    * @throws { BusinessError } 10200001 - The value of index is out of range.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
@@ -168,7 +183,8 @@ declare class List<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   insert(element: T, index: number): void;
   /**
@@ -199,9 +215,10 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Obtains the element at the specified position in this container.
+   * Returns the element at the specified position in this list,
+   * or returns undefined if this list is empty
    *
-   * @param { number } index - Position index of the target element.
+   * @param { number } index - index index specified position
    * @returns { T } the T type
    * @throws { BusinessError } 10200011 - The get method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
@@ -213,6 +230,21 @@ declare class List<T> {
    * @since 12
    */
   get(index: number): T;
+
+  /**
+   * Returns the element at the specified position in this list,
+   * or returns undefined if this list is empty
+   *
+   * @param { number } index - specified position
+   * @returns { T | undefined} the element at the specified index, or undefined if the index is out of range.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get(index: number): T | undefined;
+
   /**
    * Check if list contains the specified element
    *
@@ -233,15 +265,16 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Checks whether this container has the specified element.
+   * Check if list contains the specified element
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to be contained
    * @returns { boolean } the boolean type,if list contains the specified element,return true,else return false
    * @throws { BusinessError } 10200011 - The has method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   has(element: T): boolean;
   /**
@@ -266,15 +299,17 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Obtains the index of the first occurrence of the specified element in this container.
+   * Returns the index of the first occurrence of the specified element
+   * in this list, or -1 if this list does not contain the element.
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to be contained
    * @returns { number } the number type ,returns the lowest index such that or -1 if there is no such index.
    * @throws { BusinessError } 10200011 - The getIndexOf method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getIndexOf(element: T): number;
   /**
@@ -307,9 +342,9 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Searches for an element based on its index and then removes it.
+   * Find the corresponding element according to the index.
    *
-   * @param { number } index - Position index of the target element.
+   * @param { number } index - index index the index in the list
    * @returns { T } the T type ,returns undefined if list is empty,If the index is
    * out of bounds (greater than or equal to length or less than 0), throw an exception
    * @throws { BusinessError } 10200011 - The removeByIndex method cannot be bound.
@@ -323,6 +358,23 @@ declare class List<T> {
    * @since 12
    */
   removeByIndex(index: number): T;
+
+  /**
+   * Find the corresponding element according to the index.
+   *
+   * @param { number } index - the index in the linkedList
+   * @returns { T | undefined } the T type, if the index is
+   * out of bounds (greater than or equal to length or less than 0), throw an exception
+   * @throws { BusinessError } 10200001 - The value of "index" is out of range. It must be >= 0 && <= ${length - 1}.
+   * Received value is: ${index}
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  removeByIndex(index: number): T | undefined;
+
   /**
    * Removes the first occurrence of the specified element from this list,
    * if it is present.  If the list does not contain the element, it is
@@ -347,15 +399,18 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Removes the first occurrence of the specified element from this container.
+   * Removes the first occurrence of the specified element from this list,
+   * if it is present.  If the list does not contain the element, it is
+   * unchanged.  More formally, removes the element with the lowest index
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to remove
    * @returns { boolean } the boolean type ,If there is no such element, return false
    * @throws { BusinessError } 10200011 - The remove method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   remove(element: T): boolean;
   /**
@@ -380,15 +435,17 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Obtains the index of the last occurrence of the specified element in this container.
+   * Returns in the index of the last occurrence of the specified element in this list ,
+   * or -1 if the list does not contain the element.
    *
-   * @param { T } element - Target element.
+   * @param { T } element - element element element to find
    * @returns { number } the number type
    * @throws { BusinessError } 10200011 - The getLastIndexOf method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getLastIndexOf(element: T): number;
   /**
@@ -411,7 +468,8 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Obtains the first element in this container.
+   * Returns the first element (the item at index 0) of this list.
+   * or returns undefined if list is empty
    *
    * @returns { T } the T type ,returns undefined if list is empty
    * @throws { BusinessError } 10200011 - The getFirst method cannot be bound.
@@ -441,7 +499,8 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Obtains the last element in this container.
+   * Returns the Last element (the item at index length-1) of this list.
+   * or returns undefined if list is empty
    *
    * @returns { T } the T type ,returns undefined if list is empty
    * @throws { BusinessError } 10200011 - The getLast method cannot be bound.
@@ -451,6 +510,33 @@ declare class List<T> {
    * @since 12
    */
   getLast(): T;
+
+  /**
+   * Returns the first element (the item at index 0) of this list.
+   * or returns undefined if list is empty
+   *
+   * @returns { T | undefined } the T type, returns undefined if list is empty
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getFirst(): T | undefined;
+
+  /**
+   * Returns the Last element (the item at index length-1) of this list.
+   * or returns undefined if list is empty
+   *
+   * @returns { T | undefined } the T type, returns undefined if list is empty
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getLast(): T | undefined;
+
   /**
    * Replaces the element at the specified position in this List with the specified element
    *
@@ -481,10 +567,10 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Replaces an element at the specified position in this container with a given element.
+   * Replaces the element at the specified position in this List with the specified element
    *
-   * @param { number } index - 	Position index of the target element.
-   * @param { T } element - Element to be used for replacement.
+   * @param { number } index - index index index to find
+   * @param { T } element - element element replaced element
    * @returns { T } the T type
    * @throws { BusinessError } 10200011 - The set method cannot be bound.
    * @throws { BusinessError } 10200001 - The value of index is out of range.
@@ -497,6 +583,21 @@ declare class List<T> {
    * @since 12
    */
   set(index: number, element: T): T;
+  /**
+   * Replaces the element at the specified position in this List with the specified element
+   *
+   * @param { number } index - index to find
+   * @param { T } element - replaced element
+   * @returns { T | undefined } the T type, returns undefined if linkedList is empty
+   * @throws { BusinessError } 10200001 - The value of "index" is out of range. It must be >= 0 && <= ${length - 1}.
+   * Received value is: ${index}
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  set(index: number, element: T): T | undefined;
   /**
    * Compares the specified object with this list for equality.if the object are the same as this list
    * return true, otherwise return false.
@@ -519,15 +620,17 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Compares whether a specified object is equal to this container.
+   * Compares the specified object with this list for equality.if the object are the same as this list
+   * return true, otherwise return false.
    *
-   * @param { Object } obj - Object used for comparison.
+   * @param { Object } obj - obj obj Compare objects
    * @returns { boolean } the boolean type
    * @throws { BusinessError } 10200011 - The equal method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   equal(obj: Object): boolean;
   /**
@@ -564,10 +667,14 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Uses a callback to traverse the elements in this container and obtain their position indexes.
+   * Replaces each element of this list with the result of applying the operator to that element.
    *
-   * @param { function } callbackFn - Callback invoked for the replacement.
-   * @param { Object } [thisArg] - Value of this to use when callbackFn is invoked. The default value is this instance.
+   * @param { function } callbackFn - callbackFn
+   * callbackFn (required) A function that accepts up to three arguments.
+   * The function to be called for each element.
+   * @param { Object } [thisArg] - thisArg
+   * thisArg (Optional) The value to be used as this value for when callbackFn is called.
+   * If thisArg is omitted, undefined is used as the this value.
    * @throws { BusinessError } 10200011 - The forEach method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -578,6 +685,19 @@ declare class List<T> {
    * @since 12
    */
   forEach(callbackFn: (value: T, index?: number, List?: List<T>) => void, thisArg?: Object): void;
+
+  /**
+   * Replaces each element of this list with the result of applying the operator to that element.
+   *
+   * @param { ListForEachCb } callbackFn - callbackFn
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackfn: ListForEachCb<T>): void;
+
   /**
    * Sorts this list according to the order induced by the specified comparator
    *
@@ -610,9 +730,13 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Sorts elements in this container.
+   * Sorts this list according to the order induced by the specified comparator
    *
-   * @param { function } comparator - Callback invoked for sorting.
+   * @param { function } comparator - comparator
+   * comparator (required) A function that accepts up to two arguments.
+   * Specifies the sort order. Must be a function,return number type,If it returns firstValue
+   * minus secondValue, it returns an list sorted in ascending order;If it returns secondValue
+   * minus firstValue, it returns an list sorted in descending order;
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
    * 2.Incorrect parameter types.
@@ -620,7 +744,8 @@ declare class List<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   sort(comparator: (firstValue: T, secondValue: T) => number): void;
   /**
@@ -641,13 +766,15 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Clears this container and sets its length to 0.
+   * Removes all of the elements from this list.The list will
+   * be empty after this call returns.length becomes 0
    *
    * @throws { BusinessError } 10200011 - The clear method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clear(): void;
   /**
@@ -680,11 +807,10 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Obtains elements within a range in this container, including the element at the start position but not that at the
-   * end position, and returns these elements as a new List instance.
+   * Returns a view of the portion of this list between the specified fromIndex,inclusive,and toIndex,exclusive
    *
-   * @param { number } fromIndex - Index of the start position.
-   * @param { number } toIndex - Index of the end position.
+   * @param { number } fromIndex - fromIndex fromIndex The starting position of the index, containing the value at that index position
+   * @param { number } toIndex - toIndex toIndex the end of the index, excluding the value at that index
    * @returns { List<T> }
    * @throws { BusinessError } 10200011 - The getSubList method cannot be bound.
    * @throws { BusinessError } 10200001 - The value of fromIndex or toIndex is out of range.
@@ -694,7 +820,8 @@ declare class List<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getSubList(fromIndex: number, toIndex: number): List<T>;
   /**
@@ -731,10 +858,14 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Replaces all elements in this container with new elements, and returns the new ones.
+   * Replaces each element of this list with the result of applying the operator to that element.
    *
-   * @param { function } callbackFn - Callback invoked for the replacement.
-   * @param { Object } [thisArg] - Value of this to use when callbackFn is invoked. The default value is this instance.
+   * @param { function } callbackFn - callbackFn
+   * callbackFn (required) A function that accepts up to three arguments.
+   * The function to be called for each element.
+   * @param { Object } [thisArg] - thisArg
+   * thisArg (Optional) The value to be used as this value for when callbackFn is called.
+   * If thisArg is omitted, undefined is used as the this value.
    * @throws { BusinessError } 10200011 - The replaceAllElements method cannot be bound.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -745,6 +876,19 @@ declare class List<T> {
    * @since 12
    */
   replaceAllElements(callbackFn: (value: T, index?: number, list?: List<T>) => T, thisArg?: Object): void;
+
+  /**
+   * Replaces each element of this list with the result of applying the operator to that element.
+   *
+   * @param { ListReplaceCb } callbackFn - callbackFn
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  replaceAllElements(callbackfn: ListReplaceCb<T>): void;
+
   /**
    * convert list to array
    *
@@ -763,14 +907,15 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Converts this container into an array.
+   * convert list to array
    *
    * @returns { Array<T> } the Array type
    * @throws { BusinessError } 10200011 - The convertToArray method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   convertToArray(): Array<T>;
   /**
@@ -791,16 +936,43 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Checks whether this container is empty (contains no element).
+   * Determine whether list is empty and whether there is an element
    *
    * @returns { boolean } the boolean type
    * @throws { BusinessError } 10200011 - The isEmpty method cannot be bound.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   isEmpty(): boolean;
+  /**
+     * Returns the item at that index
+     *
+     * @param { number } index - the zero-based index of the desired code unit.
+     * @returns { T | undefined } the element in the list matching the given index,
+     * or undefined if the index is out of range.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    $_get(index: number): T | undefined;
+
+    /**
+     * Set the value of item at that index.
+     *
+     * @param { number } index – the index of the element to set.
+     * @param { T } value – the value to set at the specified index
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    $_set(index: number, value: T): void;
   /**
    * returns an iterator.Each item of the iterator is a Javascript Object
    *
@@ -819,7 +991,7 @@ declare class List<T> {
    * @since 10
    */
   /**
-   * Obtains an iterator, each item of which is a JavaScript object.
+   * returns an iterator.Each item of the iterator is a Javascript Object
    *
    * @returns { IterableIterator<T> }
    * @throws { BusinessError } 10200011 - The Symbol.iterator method cannot be bound.
@@ -829,6 +1001,49 @@ declare class List<T> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<T>;
+
+  /**
+   * returns an iterator. Each item of the iterator is a ArkTS Object
+   *
+   * @returns { IterableIterator<T> }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<T>;
+
 }
 
+/**
+ * The type of List callback function.
+ *
+ * @typedef { function } ListForEachCb
+ * @param { T } value - The value of current element
+ * @param { number } index - The index of current element
+ * @param { List<T> } list - The List instance being traversed
+ * @returns { void } This callback does not return a value
+ * @syscap SystemCapability.Utils.Lang
+ * @atomicservice
+ * @since 20
+ * @arkts 1.2
+ */
+type ListForEachCb<T> = (value: T, index: number, list: List<T>) => void
+
+/**
+ * The type of List callback function.
+ *
+ * @typedef { function } LinkedListForEachCb
+ * @param { T } value - The old value of current element
+ * @param { number } index - The index of current element
+ * @param { List<T> } list - The List instance being traversed
+ * @returns { T } - The new value of current element
+ * @syscap SystemCapability.Utils.Lang
+ * @atomicservice
+ * @since 20
+ * @arkts 1.2
+ */
+type ListReplaceCb<T> = (value: T, index: number, list: List<T>) => T
+
 export default List;
diff --git a/api/@ohos.util.PlainArray.d.ts b/api/@ohos.util.PlainArray.d.ts
index 4da484961b12ef65706d2666804b786cd9a629c6..6b28d6ba1121cdb78e75016f0395d057e5a114e0 100644
--- a/api/@ohos.util.PlainArray.d.ts
+++ b/api/@ohos.util.PlainArray.d.ts
@@ -40,7 +40,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class PlainArray<T> {
   /**
@@ -65,7 +66,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   constructor();
   /**
@@ -93,6 +95,19 @@ declare class PlainArray<T> {
    * @since 12
    */
   length: number;
+
+  /**
+   * Gets the element number of the PlainArray.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
+
   /**
    * Appends a key-value pair to PlainArray
    *
@@ -130,7 +145,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   add(key: number, value: T): void;
   /**
@@ -155,7 +171,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clear(): void;
   /**
@@ -183,7 +200,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clone(): PlainArray<T>;
   /**
@@ -223,7 +241,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   has(key: number): boolean;
   /**
@@ -266,6 +285,21 @@ declare class PlainArray<T> {
    * @since 12
    */
   get(key: number): T;
+
+  /**
+   * Queries the value associated with the specified key
+   *
+   * @param { number } key - looking for goals
+   * @returns { T | undefined } the value of key-value pairs
+   * @throws { BusinessError } 10200001 - The value of index is out of range.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get(key: number): T | undefined;
+
   /**
    * Queries the index for a specified key
    *
@@ -303,7 +337,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getIndexOfKey(key: number): number;
   /**
@@ -334,7 +369,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getIndexOfValue(value: T): number;
   /**
@@ -362,7 +398,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   isEmpty(): boolean;
   /**
@@ -402,7 +439,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getKeyAt(index: number): number;
   /**
@@ -445,6 +483,21 @@ declare class PlainArray<T> {
    * @since 12
    */
   remove(key: number): T;
+
+  /**
+   * Remove the key-value pair based on a specified key if it exists and return the value
+   *
+   * @param { number } key - target to be deleted
+   * @returns { T | undefined } target mapped value, or undefined if key is not exist
+   * @throws { BusinessError } 10200001 - The value of index is out of range.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  remove(key: number): T | undefined;
+
   /**
    * Remove the key-value pair at a specified index if it exists and return the value
    *
@@ -485,6 +538,21 @@ declare class PlainArray<T> {
    * @since 12
    */
   removeAt(index: number): T;
+
+  /**
+   * Remove the key-value pair at a specified index if it exists and return the value
+   *
+   * @param { number } index - target subscript for search
+   * @returns { T | undefined } the T type, or undefined if container is empty
+   * @throws { BusinessError } 10200001 - The value of index is out of range.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  removeAt(index: number): T | undefined;
+
   /**
    * Remove a group of key-value pairs from a specified index
    *
@@ -528,7 +596,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   removeRangeFrom(index: number, size: number): number;
   /**
@@ -571,7 +640,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   setValueAt(index: number, value: T): void;
   /**
@@ -599,7 +669,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   toString(): String;
   /**
@@ -642,7 +713,8 @@ declare class PlainArray<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   getValueAt(index: number): T;
   /**
@@ -697,6 +769,19 @@ declare class PlainArray<T> {
    * @since 12
    */
   forEach(callbackFn: (value: T, index?: number, PlainArray?: PlainArray<T>) => void, thisArg?: Object): void;
+
+  /**
+   * Executes a provided function once for each value in the PlainArray object.
+   *
+   * @param { PlainArrayForEachCb<T> } callbackFn - callbackFn
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackFn: PlainArrayForEachCb<T>): void;
+
   /**
    * returns an iterator.Each item of the iterator is a Javascript Object
    *
@@ -725,6 +810,34 @@ declare class PlainArray<T> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<[number, T]>;
+
+  /**
+   * returns an iterator. Each item of the iterator is a ArkTS Object
+   *
+   * @returns { IterableIterator<[number, T]> }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<[number, T]>;
+
 }
 
+/**
+ * The type of PlainArray callback function.
+ *
+ * @typedef { function } PlainArrayForEachCb
+ * @param { T } value - The value of current element
+ * @param { number } key - The key of current element
+ * @param { PlainArray<T> } PlainArray - The PlainArray instance being traversed
+ * @returns { void } This callback does not return a value
+ * @syscap SystemCapability.Utils.Lang
+ * @atomicservice
+ * @since 20
+ * @arkts 1.2
+ */
+type PlainArrayForEachCb<T> = (value: T, key: number, PlainArray: PlainArray<T>) => void
+
 export default PlainArray;
diff --git a/api/@ohos.util.Queue.d.ts b/api/@ohos.util.Queue.d.ts
index f4764226358cd4eda07f6533e894d71958f38cc1..abdba11d474fc39a97a03e70145a74614aaade00 100644
--- a/api/@ohos.util.Queue.d.ts
+++ b/api/@ohos.util.Queue.d.ts
@@ -43,7 +43,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class Queue<T> {
   /**
@@ -68,7 +69,8 @@ declare class Queue<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   constructor();
   /**
@@ -96,6 +98,19 @@ declare class Queue<T> {
    * @since 12
    */
   length: number;
+
+  /**
+   * Gets the element number of the Queue.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
+
   /**
    * Inserting specified element at the end of a queue if it is possible to do
    * so immediately without violating capacity restrictions.
@@ -127,7 +142,8 @@ declare class Queue<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   add(element: T): boolean;
   /**
@@ -158,6 +174,19 @@ declare class Queue<T> {
    * @since 12
    */
   getFirst(): T;
+
+  /**
+   * Obtains the header element of a queue.
+   *
+   * @returns { T | undefined } the first element of the queue if it exists, otherwise returns undefined.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getFirst(): T | undefined;
+
   /**
    * Retrieves and removes the head of this queue
    *
@@ -186,6 +215,19 @@ declare class Queue<T> {
    * @since 12
    */
   pop(): T;
+
+  /**
+   * Retrieves and removes the head of this queue
+   *
+   * @returns { T | undefined } the deleted element of the deque if it exists, otherwise returns undefined.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  pop(): T | undefined;
+
   /**
    * Executes a provided function once for each value in the queue object.
    *
@@ -238,6 +280,19 @@ declare class Queue<T> {
    * @since 12
    */
   forEach(callbackFn: (value: T, index?: number, Queue?: Queue<T>) => void, thisArg?: Object): void;
+
+  /**
+   * Executes a provided function once for each value in the queue object.
+   *
+   * @param { QueueForEachCb } callbackFn - callbackFn
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackfn: QueueForEachCb<T>): void;
+
   /**
    * returns an iterator.Each item of the iterator is a Javascript Object
    *
@@ -266,6 +321,34 @@ declare class Queue<T> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<T>;
+
+  /**
+   * returns an iterator. Each item of the iterator is a ArkTS Object
+   *
+   * @returns { IterableIterator<T> }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<T>;
+
 }
 
+/**
+ * The type of Queue callback function.
+ *
+ * @typedef { function } QueueForEachCb
+ * @param { T } value - The value of current element
+ * @param { number } index - The key of current element
+ * @param { Queue<T> } queue - The Queue instance being traversed
+ * @returns { void } This callback does not return a value
+ * @syscap SystemCapability.Utils.Lang
+ * @atomicservice
+ * @since 20
+ * @arkts 1.2
+ */
+type QueueForEachCb<T> = (value: T, index: number, queue: Queue<T>) => void
+
 export default Queue;
diff --git a/api/@ohos.util.Stack.d.ts b/api/@ohos.util.Stack.d.ts
index fe9713d5eacb814f207898542f6fde7b377baceb..340ed2c85f60351be061718902de490facbc13ff 100644
--- a/api/@ohos.util.Stack.d.ts
+++ b/api/@ohos.util.Stack.d.ts
@@ -40,7 +40,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class Stack<T> {
   /**
@@ -65,7 +66,8 @@ declare class Stack<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   constructor();
   /**
@@ -93,6 +95,19 @@ declare class Stack<T> {
    * @since 12
    */
   length: number;
+
+  /**
+   * Gets the element number of the Stack.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
+
   /**
    * Tests if this stack is empty
    *
@@ -118,7 +133,8 @@ declare class Stack<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   isEmpty(): boolean;
   /**
@@ -152,6 +168,20 @@ declare class Stack<T> {
    * @since 12
    */
   peek(): T;
+
+  /**
+   * Looks at the object at the top of this stack without removing it from the stack
+   * Return undefined if this stack is empty
+   *
+   * @returns { T | undefined } the top value, or undefined if container is empty
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  peek(): T | undefined;
+
   /**
    * Removes the object at the top of this stack and returns that object as the value of this function
    * an exception if the stack is empty
@@ -183,6 +213,20 @@ declare class Stack<T> {
    * @since 12
    */
   pop(): T;
+
+  /**
+   * Removes the object at the top of this stack and returns that object as the value of this function
+   * an exception if the stack is empty
+   *
+   * @returns { T | undefined } Stack top value, or undefined if container is empty
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  pop(): T | undefined;
+
   /**
    * Pushes an item onto the top of this stack
    *
@@ -211,7 +255,8 @@ declare class Stack<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   push(item: T): T;
   /**
@@ -242,7 +287,8 @@ declare class Stack<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   locate(element: T): number;
   /**
@@ -297,6 +343,19 @@ declare class Stack<T> {
    * @since 12
    */
   forEach(callbackFn: (value: T, index?: number, stack?: Stack<T>) => void, thisArg?: Object): void;
+
+  /**
+   * Executes a provided function once for each value in the Stack object.
+   *
+   * @param { StackForEachCb } callbackFn - callbackFn
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackfn: StackForEachCb<T>): void;
+
   /**
    * returns an ES6 iterator.Each item of the iterator is a Javascript Object
    *
@@ -325,6 +384,34 @@ declare class Stack<T> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<T>;
+
+  /**
+   * returns an iterator. Each item of the iterator is a ArkTS Object
+   *
+   * @returns { IterableIterator<T> }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<T>;
+
 }
 
+/**
+ * The type of Stack callback function.
+ *
+ * @typedef { function } StackForEachCb
+ * @param { T } value - The value of current element
+ * @param { number } index - The key of current element
+ * @param { Stack<T> } stack - The Stack instance being traversed
+ * @returns { void } This callback does not return a value
+ * @syscap SystemCapability.Utils.Lang
+ * @atomicservice
+ * @since 20
+ * @arkts 1.2
+ */
+type StackForEachCb<T> = (value: T, index: number, stack: Stack<T>) => void
+
 export default Stack;
diff --git a/api/@ohos.util.TreeMap.d.ts b/api/@ohos.util.TreeMap.d.ts
index 3aee29d8471e0ba7e48b72f670013c7336b4540a..ad93707e33003ce173ca9e234f8e95482e7fc10e 100644
--- a/api/@ohos.util.TreeMap.d.ts
+++ b/api/@ohos.util.TreeMap.d.ts
@@ -43,7 +43,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class TreeMap<K, V> {
   /**
@@ -92,6 +93,20 @@ declare class TreeMap<K, V> {
    * @since 12
    */
   constructor(comparator?: (firstValue: K, secondValue: K) => boolean);
+
+  /**
+   * A constructor used to create a TreeMap object.
+   *
+   * @param { TreeMapComparator<K> } [comparator] - comparator
+   * comparator (Optional) User-defined comparison functions.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  constructor(comparator?: TreeMapComparator<K>);
+
   /**
    * Gets the element number of the hashmap.
    *
@@ -117,6 +132,19 @@ declare class TreeMap<K, V> {
    * @since 12
    */
   length: number;
+
+  /**
+   * Gets the element number of the TreeMap.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
+
   /**
    * Returns whether the Map object contains elements
    *
@@ -142,7 +170,8 @@ declare class TreeMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   isEmpty(): boolean;
   /**
@@ -173,7 +202,8 @@ declare class TreeMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   hasKey(key: K): boolean;
   /**
@@ -204,7 +234,8 @@ declare class TreeMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   hasValue(value: V): boolean;
   /**
@@ -300,6 +331,46 @@ declare class TreeMap<K, V> {
    * @since 12
    */
   getLastKey(): K;
+
+  /**
+   * Returns a specified element in a Map object, or undefined if there is no corresponding element
+   *
+   * @param { K } key - key key the index in TreeMap
+   * @returns { V | undefined } value if associated with key presents, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get(key: K): V | undefined;
+
+  /**
+   * Obtains the first sorted key in the treemap.
+   * Or returns undefined if tree map is empty
+   *
+   * @returns { K | undefined } the key of the first element if exists, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getFirstKey(): K | undefined;
+
+  /**
+   * Obtains the last sorted key in the treemap.
+   * Or returns undefined if tree map is empty
+   *
+   * @returns { K | undefined } the key of the last element if exists, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getLastKey(): K | undefined;
+
   /**
    * Adds all element groups in one map to another map
    *
@@ -334,7 +405,8 @@ declare class TreeMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   setAll(map: TreeMap<K, V>): void;
   /**
@@ -380,7 +452,8 @@ declare class TreeMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   set(key: K, value: V): Object;
   /**
@@ -414,6 +487,20 @@ declare class TreeMap<K, V> {
    * @since 12
    */
   remove(key: K): V;
+
+  /**
+   * Remove a specified element from a Map object
+   *
+   * @param { K } key - key key Target to be deleted
+   * @returns { V | undefined } the value of the removed element, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  remove(key: K): V | undefined;
+
   /**
    * Clear all element groups in the map
    *
@@ -436,7 +523,8 @@ declare class TreeMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clear(): void;
   /**
@@ -507,6 +595,35 @@ declare class TreeMap<K, V> {
    * @since 12
    */
   getHigherKey(key: K): K;
+
+  /**
+   * Returns the greatest element smaller than or equal to the specified key
+   * if the key does not exist, undefined is returned
+   *
+   * @param { K } key - key key Objective of comparison
+   * @returns { K | undefined } the lower key of the given key's element if exists, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getLowerKey(key: K): K | undefined;
+
+  /**
+   * Returns the least element greater than or equal to the specified key
+   * if the key does not exist, undefined is returned
+   *
+   * @param { K } key - key key Objective of comparison
+   * @returns { K | undefined } the higher key of the given key's element if exists, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getHigherKey(key: K): K | undefined;
+
   /**
    * Returns a new Iterator object that contains the keys contained in this map
    *
@@ -532,7 +649,8 @@ declare class TreeMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   keys(): IterableIterator<K>;
   /**
@@ -560,7 +678,8 @@ declare class TreeMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   values(): IterableIterator<V>;
   /**
@@ -594,7 +713,8 @@ declare class TreeMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   replace(key: K, newValue: V): boolean;
   /**
@@ -652,6 +772,20 @@ declare class TreeMap<K, V> {
    * @since 12
    */
   forEach(callbackFn: (value?: V, key?: K, map?: TreeMap<K, V>) => void, thisArg?: Object): void;
+
+  /**
+   * Executes the given callback function once for each real key in the map.
+   * It does not perform functions on deleted keys
+   *
+   * @param { TreeMapForEachCb<K, V> } callbackFn - callbackFn
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackFn: TreeMapForEachCb<K, V>): void;
+
   /**
    * Returns a new Iterator object that contains the [key, value] pairs for each element in the Map object in insertion order
    *
@@ -677,7 +811,8 @@ declare class TreeMap<K, V> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   entries(): IterableIterator<[K, V]>;
   /**
@@ -708,6 +843,48 @@ declare class TreeMap<K, V> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<[K, V]>;
+
+  /**
+   * returns an ES6 iterator.Each item of the iterator is a Javascript Object
+   *
+   * @returns { IterableIterator<[K, V]> } an iterator for the TreeMap
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<[K, V]>;
+
 }
 
+/**
+ * The type of TreeMap callback function.
+ *
+ * @typedef { function } TreeMapForEachCb
+ * @param { V } value - The value of current element
+ * @param { K } key - The key of current element
+ * @param { TreeMap<K, V> } map - The TreeMap instance being traversed
+ * @returns { void } This callback does not return a value
+ * @syscap SystemCapability.Utils.Lang
+ * @atomicservice
+ * @since 20
+ * @arkts 1.2
+ */
+type TreeMapForEachCb<K, V> = (value: V, key: K, map: TreeMap<K, V>) => void
+
+/**
+ * The type of TreeMap comparator.
+ *
+ * @typedef { function } TreeMapComparator
+ * @param { K } firstValue - The first value compared
+ * @param { K } secondValue - The second value compared
+ * @returns { number } - Comparison results
+ * @syscap SystemCapability.Utils.Lang
+ * @atomicservice
+ * @since 20
+ * @arkts 1.2
+ */
+type TreeMapComparator<K> = (firstValue: K, secondValue: K) => number
+
 export default TreeMap;
diff --git a/api/@ohos.util.TreeSet.d.ts b/api/@ohos.util.TreeSet.d.ts
index db14019651213cf385e2d0e5c832280c1ec70369..d09e7b054817a150bab30931d0ab7b62618138db 100644
--- a/api/@ohos.util.TreeSet.d.ts
+++ b/api/@ohos.util.TreeSet.d.ts
@@ -40,7 +40,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare class TreeSet<T> {
   /**
@@ -89,6 +90,20 @@ declare class TreeSet<T> {
    * @since 12
    */
   constructor(comparator?: (firstValue: T, secondValue: T) => boolean);
+
+  /**
+   * A constructor used to create a TreeSet object.
+   *
+   * @param { TreeSetComparator<T> } [comparator] - comparator
+   * comparator (Optional) User-defined comparison functions.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  constructor(comparator?: TreeSetComparator<T>);
+
   /**
    * Gets the element number of the TreeSet.
    *
@@ -114,6 +129,19 @@ declare class TreeSet<T> {
    * @since 12
    */
   length: number;
+
+  /**
+   * Gets the element number of the TreeSet.
+   *
+   * @type { number }
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  get length(): number;
+
   /**
    * Returns whether the Set object contains elements
    *
@@ -139,7 +167,8 @@ declare class TreeSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   isEmpty(): boolean;
   /**
@@ -170,7 +199,8 @@ declare class TreeSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   has(value: T): boolean;
   /**
@@ -213,7 +243,8 @@ declare class TreeSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   add(value: T): boolean;
   /**
@@ -244,7 +275,8 @@ declare class TreeSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   remove(value: T): boolean;
   /**
@@ -269,7 +301,8 @@ declare class TreeSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   clear(): void;
   /**
@@ -476,6 +509,83 @@ declare class TreeSet<T> {
    * @since 12
    */
   popLast(): T;
+
+  /**
+   * Gets the first elements in a set
+   *
+   * @returns { T | undefined } the value of the first element if exists, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getFirstValue(): T | undefined;
+
+  /**
+   * Gets the last elements in a set
+   *
+   * @returns { T | undefined } the value of the last element if exists, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getLastValue(): T | undefined;
+
+  /**
+   * Returns the greatest element smaller than or equal to the specified key
+   * if the key does not exist, undefined is returned
+   *
+   * @param { T } key - key key Objective of comparison
+   * @returns { T | undefined } the lower value of the given key's element if exists, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getLowerValue(key: T): T | undefined;
+
+  /**
+   * Returns the least element greater than or equal to the specified key
+   * if the key does not exist, undefined is returned
+   *
+   * @param { T } key - key key Objective of comparison
+   * @returns { T | undefined } the higher value of the given key's element if exists, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  getHigherValue(key: T): T | undefined;
+
+  /**
+   * Return and delete the first element, returns undefined if tree set is empty
+   *
+   * @returns { T | undefined} the value of the first element in the TreeSet if exists, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  popFirst(): T | undefined;
+
+  /**
+   * Return and delete the last element, returns undefined if tree set is empty
+   *
+   * @returns { T | undefined } the value of the last element in the TreeSet if exists, undefined otherwise
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  popLast(): T | undefined;
+
   /**
    * Executes a provided function once for each value in the Set object.
    *
@@ -528,6 +638,19 @@ declare class TreeSet<T> {
    * @since 12
    */
   forEach(callbackFn: (value?: T, key?: T, set?: TreeSet<T>) => void, thisArg?: Object): void;
+
+  /**
+   * Executes a provided function once for each value in the Set object.
+   *
+   * @param { TreeSetForEachCb<T> } callbackFn - callbackFn
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  forEach(callbackFn: TreeSetForEachCb<T>): void;
+
   /**
    * Returns a new Iterator object that contains the values contained in this set
    *
@@ -553,7 +676,8 @@ declare class TreeSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   values(): IterableIterator<T>;
   /**
@@ -581,7 +705,8 @@ declare class TreeSet<T> {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   entries(): IterableIterator<[T, T]>;
   /**
@@ -612,6 +737,48 @@ declare class TreeSet<T> {
    * @since 12
    */
   [Symbol.iterator](): IterableIterator<T>;
+
+  /**
+   * returns an ES6 iterator.Each item of the iterator is a Javascript Object
+   *
+   * @returns { IterableIterator<T> } an iterator for the TreeSet
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  $_iterator(): IterableIterator<T>;
+
 }
 
+/**
+ * The type of TreeSet callback function.
+ *
+ * @typedef { function } TreeSetForEachCb
+ * @param { T } value - The value of current element
+ * @param { T } key - The key of current element(same as value)
+ * @param { TreeSet<T> } set - The TreeSet instance being traversed
+ * @returns { void } This callback does not return a value
+ * @syscap SystemCapability.Utils.Lang
+ * @atomicservice
+ * @since 20
+ * @arkts 1.2
+ */
+type TreeSetForEachCb<T> = (value: T, key: T, set: TreeSet<T>) => void
+
+/**
+ * The type of TreeSet comparator.
+ *
+ * @typedef { function } TreeSetComparator
+ * @param { T } firstValue - The first value compared
+ * @param { T } secondValue - The second value compared
+ * @returns { number } - Comparison results
+ * @syscap SystemCapability.Utils.Lang
+ * @atomicservice
+ * @since 20
+ * @arkts 1.2
+ */
+type TreeSetComparator<T> = (firstValue: T, secondValue: T) => number
+
 export default TreeSet;
diff --git a/api/@ohos.util.json.d.ts b/api/@ohos.util.json.d.ts
index 21e92b6c843aa59d506a8abb82fa9472ddb40b79..927eb0db21ddb0866502b95d979605409a0a0a9a 100644
--- a/api/@ohos.util.json.d.ts
+++ b/api/@ohos.util.json.d.ts
@@ -25,7 +25,8 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 12
+ * @since arkts {'1.1':'12', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare namespace json {
   /**
@@ -35,25 +36,24 @@ declare namespace json {
    * @param { Object } this - The object to which the parsed key value pair belongs.
    * @param { string } key - Attribute name.
    * @param { Object } value - The value of the parsed key value pair.
+   * @returns { Object | undefined | null } Return an Object, undefined or null value
    * @syscap SystemCapability.Utils.Lang
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   type Transformer = (this: Object, key: string, value: Object) => Object | undefined | null;
 
   /**
-   * Parses a JSON string into an ArkTS object or null.
+   * Converts a JavaScript Object Notation (JSON) string into an Object or null.
    *
-   * @param { string } text - Valid JSON string.
-   * @param { Transformer } [reviver] - Conversion function. This parameter can be used to modify the value generated
-   * after parsing. The default value is undefined.
-   * @param {ParseOptions} options - Parsing options. This parameter is used to control the type of the parsing result.
-   * The default value is undefined.
+   * @param { string } text - A valid JSON string.
+   * @param { Transformer } [reviver] - A function that transforms the results.
+   * @param {ParseOptions} options - The config of parse.
    * @returns { Object | null } Return an Object, array, string, number, boolean, or null value corresponding to JSON text.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
-   * 2.Incorrect parameter types;
-   * 3.Parameter verification failed.
+   * 2.Incorrect parameter types; 3.Parameter verification failed.
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
@@ -62,18 +62,28 @@ declare namespace json {
   function parse(text: string, reviver?: Transformer, options?: ParseOptions): Object | null;
 
   /**
-   * Converts an ArkTS object or array into a JSON string. In the case of a container, linear containers are supported,
-   * but non-linear containers are not.
+   * Converts a JavaScript Object Notation (JSON) string into an Object or null.
    *
-   * @param { Object } value - ArkTS object or array. In the case of a container, linear containers are supported, but
-   * non-linear containers are not.
-   * @param { (number | string)[] | null } [replacer] - If an array is passed in, only the keys in the array are
-   * serialized to the final JSON string. If null is passed in, all keys of the object are serialized. The default
-   * value is undefined.
-   * @param { string | number } [space] - Indentation, white space, or line break characters inserted into the output
-   * JSON string for readability purposes. If a number is passed in, it indicates the number of space characters to be
-   * used as indentation. If a string is passed in, the string is inserted before the output JSON string. If null is
-   * passed in, no white space is used. The default value is an empty string.
+   * @param { string } text - A valid JSON string.
+   * @param { Type } type - A constructor or class representing the expected type of the parsed result.
+   * @param { Transformer } [reviver] - A function that transforms the results.
+   * @param {ParseOptions} options - The config of parse.
+   * @returns { T | null | undefined } Return an Object, array, string, number, boolean, undefined, or null value corresponding to JSON text.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  function parse<T>(text: string, type: Type, reviver?: Transformer, options?: ParseOptions): T | null | undefined;
+
+  /**
+   * Converts a JavaScript value to a JavaScript Object Notation (JSON) string.
+   *
+   * @param { Object } value - A JavaScript value, usually an Object or array.
+   * @param { (number | string)[] | null } [replacer] - An array of strings and numbers that acts as an approved list
+   * for selecting the object properties that will be stringify.
+   * @param { string | number } [space] - Adds indentation, white space, and line break characters to the return-value JSON text to make it easier to read.
    * @returns { string } Return a JSON text.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -87,17 +97,27 @@ declare namespace json {
   function stringify(value: Object, replacer?: (number | string)[] | null, space?: string | number): string;
 
   /**
-   * Converts an ArkTS object or array into a JSON string. In the case of a container, linear containers are supported,
-   * but non-linear containers are not.
+   * Converts a JavaScript value to a JavaScript Object Notation (JSON) string.
+   *
+   * @param { NullishType } value - A JavaScript value, usually an NullishType or array.
+   * @param { Transformer | ((number | string)[]) | null } [replacer] - An array of strings and numbers that acts as an approved list
+   * for selecting the object properties that will be stringify.
+   * @param { string | number } [space] - Adds indentation, white space, and line break characters to the return-value JSON text to make it easier to read.
+   * @returns { string } Return a JSON text.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  function stringify(value: NullishType, replacer?: Transformer | ((number | string)[]) | null, space?: string | number): string;
+
+  /**
+   * Converts a JavaScript value to a JavaScript Object Notation (JSON) string.
    *
-   * @param { Object } value - ArkTS object or array. In the case of a container, linear containers are supported, but
-   * non-linear containers are not.
-   * @param { Transformer } [replacer] - During serialization, each key of the serialized value is converted and
-   * processed by this function. The default value is undefined.
-   * @param { string | number } [space] - Indentation, white space, or line break characters inserted into the output
-   * JSON string for readability purposes. If a number is passed in, it indicates the number of space characters to be
-   * used as indentation. If a string is passed in, the string is inserted before the output JSON string. If null is
-   * passed in, no white space is used. The default value is an empty string.
+   * @param { Object } value - A JavaScript value, usually an Object or array.
+   * @param { Transformer } [replacer] - A function that transforms the results.
+   * @param { string | number } [space] - Adds indentation, white space, and line break characters to the return-value JSON text to make it easier to read.
    * @returns { string } Return a JSON text.
    * @throws { BusinessError } 401 - Parameter error. Possible causes:
    * 1.Mandatory parameters are left unspecified;
@@ -111,8 +131,8 @@ declare namespace json {
   function stringify(value: Object, replacer?: Transformer, space?: string | number): string;
 
   /**
-   * Checks whether an ArkTS object contains a key.
-   * 
+   * Checks whether the object parsed from a JSON string contains the property.
+   *
    * @param { object } obj - The object parsed from a JSON string.
    * @param { string } property - Determine whether the object contains the property.
    * @returns { boolean } Return true if the key is in the object, otherwise return false.
@@ -120,12 +140,13 @@ declare namespace json {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   function has(obj: object, property: string): boolean;
 
   /**
-   * Removes a key from an ArkTS object.
+   * Removes a property from the object parsed from a JSON string.
    *
    * @param { object } obj - The object parsed from a JSON string.
    * @param { string } property - The property to be removed.
@@ -144,7 +165,8 @@ declare namespace json {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   const enum BigIntMode {
     /**
@@ -153,7 +175,8 @@ declare namespace json {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     DEFAULT = 0,
     /**
@@ -162,7 +185,8 @@ declare namespace json {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     PARSE_AS_BIGINT = 1,
     /**
@@ -171,7 +195,8 @@ declare namespace json {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     ALWAYS_PARSE_AS_BIGINT = 2,
   }
@@ -183,7 +208,8 @@ declare namespace json {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   interface ParseOptions {
     /**
@@ -192,7 +218,8 @@ declare namespace json {
     * @syscap SystemCapability.Utils.Lang
     * @crossplatform
     * @atomicservice
-    * @since 12
+    * @since arkts {'1.1':'12', '1.2':'20'}
+    * @arkts 1.1&1.2
     */
     bigIntMode: BigIntMode;
   }
diff --git a/api/@ohos.util.stream.d.ts b/api/@ohos.util.stream.d.ts
index 072128b1f71e20d2b12a64c66514a83e350f5984..0903242cb7a427fb580c3f0080d8b9b6514573ba 100644
--- a/api/@ohos.util.stream.d.ts
+++ b/api/@ohos.util.stream.d.ts
@@ -31,16 +31,29 @@
   * @syscap SystemCapability.Utils.Lang
   * @crossplatform
   * @atomicservice
-  * @since 12
+  * @since arkts {'1.1':'12', '1.2':'20'}
+  * @arkts 1.1&1.2
   */
 declare namespace stream {
+  /**
+   * The type of stream callback function.
+   *
+   * @typedef { function } StreamCb
+   * @returns { void } - The function return void
+   * @syscap SystemCapability.Utils.Lang
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  type StreamCb = () => void;
   /**
    * Streams to which data can be written.
    *
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   class Writable {
     /**
@@ -49,7 +62,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     constructor();
     /**
@@ -74,8 +88,30 @@ declare namespace stream {
      * @crossplatform
      * @atomicservice
      * @since 12
-    */
+     */
     write(chunk?: string | Uint8Array, encoding?: string, callback?: Function): boolean;
+
+    /**
+     * writes a chunk to Writable and invokes callback when the chunk is flushed. The return value indicates
+     * whether the internal buffer of the Writable reaches the hightWaterMark. If true is returned, the buffer
+     * does not reach the hightWaterMark. If false is returned, the buffer has been reached. The write function
+     * should be called after the drain event is triggered. If the write function is called continuously,
+     * the chunk is still added to the buffer until the memory overflows
+     *
+     * @param { string | Uint8Array } [chunk] - Data to be written.
+     * @param { string } [encoding] - Encoding type.
+     * @param { StreamCb } [callback] - Callback after writing.
+     * @returns { boolean } Write success returns true, write failure returns false.
+     * @throws { BusinessError } 10200035 - The doWrite method has not been implemented.
+     * @throws { BusinessError } 10200036 - The stream has been ended.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    write(chunk?: string | Uint8Array, encoding?: string, callback?: StreamCb): boolean;
+
     /**
      * Write the last chunk to Writable.
      *
@@ -94,6 +130,23 @@ declare namespace stream {
      * @since 12
      */
     end(chunk?: string | Uint8Array, encoding?: string, callback?: Function): Writable;
+
+    /**
+     * Write the last chunk to Writable.
+     *
+     * @param { string | Uint8Array } [chunk] - Data to be written.
+     * @param { string } [encoding] - Encoding type.
+     * @param { StreamCb } [callback] - Callback after writing.
+     * @returns { Writable } Returns the Writable object.
+     * @throws { BusinessError } 10200035 - The doWrite method has not been implemented.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    end(chunk?: string | Uint8Array, encoding?: string, callback?: StreamCb): Writable;
+
     /**
      * Set the default encoding mode.
      *
@@ -106,8 +159,9 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
-    */
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
+     */
     setDefaultEncoding(encoding?: string): boolean;
     /**
      * After the call, all Write operations will be forced to write to the buffer instead of being flushed.
@@ -116,7 +170,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     cork(): boolean;
     /**
@@ -126,7 +181,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     uncork(): boolean;
     /**
@@ -141,7 +197,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     on(event: string, callback: Callback<emitter.EventData>): void;
     /**
@@ -155,7 +212,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     off(event: string, callback?: Callback<emitter.EventData>): void;
     /**
@@ -172,6 +230,20 @@ declare namespace stream {
      * @since 12
      */
     doInitialize(callback: Function): void;
+
+    /**
+     * This method is invoked by the Writable method during initialization and must not be invoked directly.
+     * After the resource is initialized in the doInitialize method, the callback () method is invoked.
+     *
+     * @param { StreamCb } callback - Callback when the stream has completed the initial.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    doInitialize(callback: StreamCb): void;
+
     /**
      * Implemented by subclass inheritance. The implementation logic of flushing chunks in the buffer must not be
      * directly called. The call is controlled by Writable.write.
@@ -189,6 +261,20 @@ declare namespace stream {
      * @since 12
      */
     doWrite(chunk: string | Uint8Array, encoding: string, callback: Function): void;
+    /**
+     * Implemented by subclass inheritance. The implementation logic of flushing chunks in the buffer must not be
+     * directly called. The call is controlled by Writable.write.
+     *
+     * @param { string | Uint8Array } [chunk] - Data to be written.
+     * @param { string } [encoding] - Encoding type.
+     * @param { StreamCb } [callback] - Callback after writing.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    doWrite(chunk: string | Uint8Array, encoding: string, callback: StreamCb): void;
     /**
      * The implementation logic of flushing chunks in the buffer in batches should not be actively called.
      * The call is controlled by Writable.write.
@@ -205,6 +291,20 @@ declare namespace stream {
      * @since 12
      */
     doWritev(chunks: string[] | Uint8Array[], callback: Function): void;
+    /**
+     * The implementation logic of flushing chunks in the buffer in batches should not be actively called.
+     * The call is controlled by Writable.write.
+     *
+     * @param { string[] | Uint8Array[] } [chunks] - Data to be written.
+     * @param { StreamCb } [callback] - Callback after writing.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    doWritev(chunks: string[] | Uint8Array[], callback: StreamCb): void;
+
     /**
      * Returns boolean indicating whether it is in ObjectMode.
      *
@@ -213,7 +313,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writableObjectMode: boolean;
     /**
@@ -224,7 +325,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writableHighWatermark: number;
     /**
@@ -235,7 +337,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writable: boolean;
     /**
@@ -246,7 +349,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writableLength: number;
     /**
@@ -257,7 +361,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writableCorked: number;
     /**
@@ -268,7 +373,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writableEnded: boolean;
     /**
@@ -279,7 +385,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writableFinished: boolean;
   }
@@ -291,7 +398,8 @@ declare namespace stream {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   class Transform extends Duplex {
     /**
@@ -300,7 +408,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     constructor();
     /**
@@ -321,6 +430,23 @@ declare namespace stream {
      * @since 12
      */
     doTransform(chunk: string, encoding: string, callback: Function): void;
+
+    /**
+     * Convert the input data. After the conversion, Transform.push can be called to send the input to the read stream.
+     * Transform.push should not be called Transform.write to call.
+     *
+     * @param { string } chunk - Input data to be converted.
+     * @param { string } encoding - If the chunk is a string, then this is the encoding type. If chunk is a buffer,
+     * then this is the special value 'buffer'. Ignore it in that case.
+     * @param { StreamCb } callback - Callback after conversion.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    doTransform(chunk: string, encoding: string, callback: StreamCb): void;
+
     /**
      * After all data is flushed to the write stream, you can use the Transform.doFlush writes some extra data, must
      * not be called directly, only called by Writable after flushing all data.
@@ -336,6 +462,20 @@ declare namespace stream {
      * @since 12
      */
     doFlush(callback: Function): void;
+
+    /**
+     * After all data is flushed to the write stream, you can use the Transform.doFlush writes some extra data, must
+     * not be called directly, only called by Writable after flushing all data.
+     *
+     * @param { StreamCb } callback - Callback after flush completion.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    doFlush(callback: StreamCb): void;
+
   }
 
   /**
@@ -345,7 +485,8 @@ declare namespace stream {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   interface ReadableOptions {
     /**
@@ -362,7 +503,8 @@ declare namespace stream {
     * @syscap SystemCapability.Utils.Lang
     * @crossplatform
     * @atomicservice
-    * @since 12
+    * @since arkts {'1.1':'12', '1.2':'20'}
+    * @arkts 1.1&1.2
     */
     encoding?: string;
   }
@@ -373,7 +515,8 @@ declare namespace stream {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
    class Readable {
     /**
@@ -382,7 +525,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     constructor();
     /**
@@ -396,7 +540,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     constructor(options: ReadableOptions);
     /**
@@ -413,7 +558,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     read(size?: number): string | null;
     /**
@@ -423,7 +569,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     resume(): Readable;
     /**
@@ -433,7 +580,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     pause(): Readable;
     /**
@@ -447,7 +595,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setEncoding(encoding?: string): boolean;
     /**
@@ -457,7 +606,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     isPaused(): boolean;
     /**
@@ -473,7 +623,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     pipe(destination: Writable, options?: Object): Writable;
     /**
@@ -488,7 +639,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     unpipe(destination?: Writable): Readable;
     /**
@@ -502,7 +654,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     on(event: string, callback: Callback<emitter.EventData>): void;
     /**
@@ -516,7 +669,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     off(event: string, callback?: Callback<emitter.EventData>): void;
     /**
@@ -534,6 +688,20 @@ declare namespace stream {
      * @since 12
      */
     doInitialize(callback: Function): void;
+
+    /**
+     * It may be implemented by child classes, and if so, will be called by the Readable class methods only.
+     * It must not be called directly.
+     *
+     * @param { StreamCb } callback - Callback when the stream has completed the initial.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    doInitialize(callback: StreamCb): void;
+
     /**
      * The specific implementation of data production. It must not be actively called. 
      * After data production, Readable.push should be called to push the produced data into the buffer.
@@ -547,7 +715,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     doRead(size: number): void;
     /**
@@ -564,7 +733,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     push(chunk: Uint8Array | string | null, encoding?: string): boolean;
     /**
@@ -575,7 +745,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly readableObjectMode: boolean;
     /**
@@ -587,7 +758,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly readable: boolean;
     /**
@@ -598,7 +770,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly readableHighWatermark: number;
     /**
@@ -609,7 +782,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly readableFlowing: boolean | null;
     /**
@@ -620,7 +794,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly readableLength: number;
     /**
@@ -632,7 +807,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly readableEncoding: string | null;
     /**
@@ -643,7 +819,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly readableEnded: boolean;
   }
@@ -654,7 +831,8 @@ declare namespace stream {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 12
+   * @since arkts {'1.1':'12', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   class Duplex extends Readable {
     /**
@@ -663,7 +841,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     constructor();
     /**
@@ -690,6 +869,29 @@ declare namespace stream {
      * @since 12
      */
     write(chunk?: string | Uint8Array, encoding?: string, callback?: Function): boolean;
+
+    /**
+     * writes a chunk to Writable and invokes callback when the chunk is flushed. The return value indicates
+     * whether the internal buffer of the Writable reaches the hightWaterMark. If true is returned, the buffer
+     * does not reach the hightWaterMark. If false is returned, the buffer has been reached. The write function
+     * should be called after the drain event is triggered. If the write function is called continuously,
+     * the chunk is still added to the buffer until the memory overflows
+     *
+     * @param { string | Uint8Array } [chunk] - Data to be written.
+     * @param { string } [encoding] - Encoding type.
+     * @param { StreamCb } [callback] - Callback after writing.
+     * @returns { boolean } Write success returns true, write failure returns false.
+     * @throws { BusinessError } 10200036 - The stream has been ended.
+     * @throws { BusinessError } 10200037 - The callback is invoked multiple times consecutively.
+     * @throws { BusinessError } 10200039 - The doTransform method has not been implemented for a class that inherits from Transform.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    write(chunk?: string | Uint8Array, encoding?: string, callback?: StreamCb): boolean;
+
     /**
      * Write the last chunk to Writable.
      *
@@ -708,6 +910,23 @@ declare namespace stream {
      * @since 12
      */
     end(chunk?: string | Uint8Array, encoding?: string, callback?: Function): Writable;
+
+    /**
+     * Write the last chunk to Writable.
+     *
+     * @param { string | Uint8Array } [chunk] - Data to be written.
+     * @param { string } [encoding] - Encoding type.
+     * @param { StreamCb } [callback] - Callback after writing.
+     * @returns { Writable } Returns the Writable object.
+     * @throws { BusinessError } 10200039 - The doTransform method has not been implemented for a class that inherits from Transform.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    end(chunk?: string | Uint8Array, encoding?: string, callback?: StreamCb): Writable;
+
     /**
      * Set the default encoding mode.
      *
@@ -720,7 +939,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setDefaultEncoding(encoding?: string): boolean;
     /**
@@ -730,7 +950,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     cork(): boolean;
     /**
@@ -740,7 +961,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     uncork(): boolean;
     /**
@@ -760,6 +982,22 @@ declare namespace stream {
      * @since 12
      */
     doWrite(chunk: string | Uint8Array, encoding: string, callback: Function): void;
+
+    /**
+     * Implemented by subclass inheritance. The implementation logic of flushing chunks in the buffer must not be
+     * directly called. The call is controlled by Writable.write.
+     *
+     * @param { string | Uint8Array } [chunk] - Data to be written.
+     * @param { string } [encoding] - Encoding type.
+     * @param { StreamCb } [callback] - Callback after writing.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    doWrite(chunk: string | Uint8Array, encoding: string, callback: StreamCb): void;
+
     /**
      * The implementation logic of flushing chunks in the buffer in batches should not be actively called.
      * The call is controlled by Writable.write.
@@ -776,6 +1014,21 @@ declare namespace stream {
      * @since 12
      */
     doWritev(chunks: string[] | Uint8Array[], callback: Function): void;
+
+    /**
+     * The implementation logic of flushing chunks in the buffer in batches should not be actively called.
+     * The call is controlled by Writable.write.
+     *
+     * @param { string[] | Uint8Array[] } [chunks] - Data to be written.
+     * @param { StreamCb } [callback] - Callback after writing.
+     * @syscap SystemCapability.Utils.Lang
+     * @crossplatform
+     * @atomicservice
+     * @since 20
+     * @arkts 1.2
+     */
+    doWritev(chunks: string[] | Uint8Array[], callback: StreamCb): void;
+
     /**
      * Returns boolean indicating whether it is in ObjectMode.
      *
@@ -784,7 +1037,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writableObjectMode: boolean;
     /**
@@ -795,7 +1049,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writableHighWatermark: number;
     /**
@@ -806,7 +1061,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writable: boolean;
     /**
@@ -817,7 +1073,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writableLength: number;
     /**
@@ -828,7 +1085,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writableCorked: number;
     /**
@@ -839,7 +1097,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writableEnded: boolean;
     /**
@@ -850,7 +1109,8 @@ declare namespace stream {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 12
+     * @since arkts {'1.1':'12', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     readonly writableFinished: boolean;
   }
diff --git a/api/@ohos.xml.d.ts b/api/@ohos.xml.d.ts
index 97251381492d0dcf8e0859f8810bde6fc5241796..028a850f9391bdb2d12f420165ca455f2914c1a5 100644
--- a/api/@ohos.xml.d.ts
+++ b/api/@ohos.xml.d.ts
@@ -40,16 +40,18 @@
  * @syscap SystemCapability.Utils.Lang
  * @crossplatform
  * @atomicservice
- * @since 11
+ * @since arkts {'1.1':'11', '1.2':'20'}
+ * @arkts 1.1&1.2
  */
 declare namespace xml {
-  /**
+    /**
    * The XmlDynamicSerializer interface is used to dynamically generate an xml file.
    *
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 20
+   * @since arkts {'1.1':'20', '1.2':'20'}
+   * @arkts 1.1&1.2
    * @name XmlDynamicSerializer
    */
   class XmlDynamicSerializer {
@@ -62,7 +64,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 20
+     * @since arkts {'1.1':'20', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     constructor(encoding?: string);
 
@@ -77,7 +80,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 20
+     * @since arkts {'1.1':'20', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setAttributes(name: string, value: string): void;
 
@@ -90,7 +94,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 20
+     * @since arkts {'1.1':'20', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     addEmptyElement(name: string): void;
 
@@ -101,7 +106,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 20
+     * @since arkts {'1.1':'20', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setDeclaration(): void;
 
@@ -114,7 +120,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 20
+     * @since arkts {'1.1':'20', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     startElement(name: string): void;
 
@@ -126,7 +133,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 20
+     * @since arkts {'1.1':'20', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     endElement(): void;
 
@@ -140,7 +148,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 20
+     * @since arkts {'1.1':'20', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setNamespace(prefix: string, namespace: string): void;
 
@@ -153,7 +162,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 20
+     * @since arkts {'1.1':'20', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setComment(text: string): void;
 
@@ -166,7 +176,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 20
+     * @since arkts {'1.1':'20', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setCdata(text: string): void;
 
@@ -179,7 +190,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 20
+     * @since arkts {'1.1':'20', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setText(text: string): void;
 
@@ -192,21 +204,23 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 20
+     * @since arkts {'1.1':'20', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setDocType(text: string): void;
 
     /**
      * Get an ArrayBuffer from a XmlDynamicSerializer instance.
      *
-     * @returns { ArrayBuffer } - Returns ArrayBuffer result from a XmlDynamicSerializer instance. Empty ArrayBuffer would return if internal error happens.
+     * @returns { ArrayBuffer } - Returns ArrayBuffer result from a XmlDynamicSerializer instance.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 20
+     * @since arkts {'1.1':'20', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     getOutput(): ArrayBuffer;
-}
+  }
   /**
    * The XmlSerializer interface is used to generate an xml file.
    *
@@ -228,7 +242,8 @@ declare namespace xml {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    * @name XmlSerializer
    */
   class XmlSerializer {
@@ -266,10 +281,14 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * A constructor used to create an XmlSerializer instance.
+     * A parameterized constructor used to create a new XmlSerializer instance.
+     * As the input parameter of the constructor function, init supports three types.
+     * The input parameter is an Arrarybuffer.
+     * The input parameter is a DataView.
+     * The input parameter is an encoding format of string type.
      *
-     * @param { ArrayBuffer | DataView } buffer - ArrayBuffer or DataView for storing the XML information to set.
-     * @param { string } [encoding] - Encoding format. The default value is 'utf-8' (the only format currently supported).
+     * @param { ArrayBuffer | DataView } buffer - A instance, the new XmlPullParser with.
+     * @param { string } [encoding] - [encoding='utf8']  this is its encoding.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types;
@@ -277,7 +296,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     constructor(buffer: ArrayBuffer | DataView, encoding?: string);
 
@@ -307,17 +327,18 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Sets an attribute.
+     * Write an attribute.
      *
-     * @param { string } name - Key of the attribute.
-     * @param { string } value - Value of the attribute.
+     * @param { string } name - Key name of the attribute.
+     * @param { string } value - Values of attribute.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types; 3.Parameter verification failed.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setAttributes(name: string, value: string): void;
 
@@ -345,9 +366,9 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Adds an empty element.
+     * Add an empty element.
      *
-     * @param { string } name - Name of the empty element to add.
+     * @param { string } name - Key name of the attribute.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types;
@@ -355,7 +376,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     addEmptyElement(name: string): void;
 
@@ -373,12 +395,13 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Sets a file declaration with encoding.
+     * Writes xml declaration with encoding. For example: <?xml version="1.0" encoding="utf-8"?>.
      *
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setDeclaration(): void;
 
@@ -406,7 +429,7 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Writes the start tag based on the given element name.
+     * Writes a element start tag with the given name.
      *
      * @param { string } name - Name of the element.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
@@ -416,7 +439,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     startElement(name: string): void;
 
@@ -434,12 +458,13 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Writes the end tag of the element.
+     * Writes end tag of the element.
      *
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     endElement(): void;
 
@@ -469,10 +494,10 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Sets the namespace for an element tag.
+     * Writes the namespace of the current element tag.
      *
-     * @param { string } prefix - Prefix of the element and its child elements.
-     * @param { string } namespace - Namespace to set.
+     * @param { string } prefix - Values name of the prefix.
+     * @param { string } namespace - Values of namespace.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types;
@@ -480,7 +505,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setNamespace(prefix: string, namespace: string): void;
 
@@ -508,9 +534,9 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Sets a comment.
+     * Writes the comment.
      *
-     * @param { string } text - Comment to set.
+     * @param { string } text - Values of comment.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types;
@@ -518,7 +544,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setComment(text: string): void;
 
@@ -546,9 +573,9 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Adds data to the CDATA tag. The structure of the generated CDATA tag is "<! <![CDATA["+ Data added + "]]>".
+     * Writes the CDATA.
      *
-     * @param { string } text - CDATA data to set.
+     * @param { string } text - Values of CDATA.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types;
@@ -556,7 +583,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setCDATA(text: string): void;
 
@@ -584,9 +612,9 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Sets a tag value.
+     * Writes the text.
      *
-     * @param { string } text - Tag value to set, which is the content of the text attribute.
+     * @param { string } text - Values of text.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types;
@@ -594,7 +622,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setText(text: string): void;
 
@@ -622,9 +651,9 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Sets a document type.
+     * Writes the DOCTYPE.
      *
-     * @param { string } text - Content of DocType to set.
+     * @param { string } text - Values of docType.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types;
@@ -632,7 +661,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     setDocType(text: string): void;
   }
@@ -659,7 +689,8 @@ declare namespace xml {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   enum EventType {
     /**
@@ -681,7 +712,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     START_DOCUMENT,
     /**
@@ -703,7 +735,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     END_DOCUMENT,
     /**
@@ -725,7 +758,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     START_TAG,
     /**
@@ -747,7 +781,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     END_TAG,
     /**
@@ -769,7 +804,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     TEXT,
     /**
@@ -791,7 +827,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     CDSECT,
     /**
@@ -813,7 +850,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     COMMENT,
     /**
@@ -835,7 +873,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     DOCDECL,
     /**
@@ -857,7 +896,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     INSTRUCTION,
     /**
@@ -879,7 +919,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     ENTITY_REFERENCE,
     /**
@@ -901,7 +942,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     WHITESPACE
   }
@@ -928,7 +970,8 @@ declare namespace xml {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   interface ParseInfo {
     /**
@@ -947,13 +990,14 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Obtains the current column number, starting from 1.
+     * The current column number, starting from 1.
      *
      * @returns { number }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     getColumnNumber(): number;
     /**
@@ -972,13 +1016,14 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Obtains the depth of this element.
+     * The current depth of the element.
      *
      * @returns { number }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     getDepth(): number;
     /**
@@ -997,13 +1042,14 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Obtains the current line number, starting from 1.
+     * The current line number, starting from 1.
      *
      * @returns { number }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     getLineNumber(): number;
     /**
@@ -1022,13 +1068,14 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Obtains the name of this element.
+     * The current element's name.
      *
      * @returns { string }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     getName(): string;
     /**
@@ -1047,13 +1094,14 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Obtains the namespace of this element.
+     * The current element's namespace.
      *
      * @returns { string }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     getNamespace(): string;
     /**
@@ -1072,13 +1120,14 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Obtains the prefix of this element.
+     * The current element's prefix.
      *
      * @returns { string }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     getPrefix(): string;
     /**
@@ -1097,13 +1146,14 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Obtains the text of the current event.
+     * The text content of the current event as String.
      *
      * @returns { string }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     getText(): string;
     /**
@@ -1122,13 +1172,14 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Checks whether the current element is empty.
+     * Returns true if the current element is empty.
      *
      * @returns { boolean }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     isEmptyElementTag(): boolean;
     /**
@@ -1147,13 +1198,14 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Checks whether the current event contains only whitespace characters.
+     * Checks whether the current TEXT event contains only whitespace characters.
      *
      * @returns { boolean }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     isWhitespace(): boolean;
     /**
@@ -1172,13 +1224,14 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Obtains the number of attributes for the current start tag.
+     * Returns the number of attributes of the current start tag.
      *
      * @returns { number }
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     getAttributeCount(): number;
   }
@@ -1205,7 +1258,8 @@ declare namespace xml {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
   interface ParseOptions {
     /**
@@ -1230,7 +1284,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     supportDoctype?: boolean;
 
@@ -1256,7 +1311,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     ignoreNameSpace?: boolean;
 
@@ -1282,7 +1338,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     tagValueCallbackFunction?: (name: string, value: string) => boolean;
 
@@ -1308,7 +1365,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     attributeValueCallbackFunction?: (name: string, value: string) => boolean;
 
@@ -1334,7 +1392,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     tokenValueCallbackFunction?: (eventType: EventType, value: ParseInfo) => boolean;
   }
@@ -1360,7 +1419,8 @@ declare namespace xml {
    * @syscap SystemCapability.Utils.Lang
    * @crossplatform
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    * @name XmlPullParser
    */
   class XmlPullParser {
@@ -1390,7 +1450,7 @@ declare namespace xml {
      * @since 10
      */
     /**
-     * Creates and returns an XmlPullParser object.
+     * A constructor used to create a new XmlPullParser instance.
      *
      * @param { ArrayBuffer | DataView } buffer - A instance, the new XmlPullParser with.
      * @param { string } [encoding] - [encoding='utf8']  this is its encoding.
@@ -1401,7 +1461,8 @@ declare namespace xml {
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 11
+     * @since arkts {'1.1':'11', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     constructor(buffer: ArrayBuffer | DataView, encoding?: string);
 
@@ -1459,16 +1520,18 @@ declare namespace xml {
     parse(option: ParseOptions): void;
 
     /**
-     * Parses XML information.
+     * Parse the XML file from XmlPullParser.
      *
-     * @param { ParseOptions } option - XML parsing options.
+     * @param { ParseOptions } option - Parse options for XmlPullParser, the interface including
+	   * two Boolean variables and three callback functions.
      * @throws { BusinessError } 401 - Parameter error. Possible causes:
      * 1.Mandatory parameters are left unspecified;
      * 2.Incorrect parameter types.
      * @syscap SystemCapability.Utils.Lang
      * @crossplatform
      * @atomicservice
-     * @since 14
+     * @since arkts {'1.1':'14', '1.2':'20'}
+     * @arkts 1.1&1.2
      */
     parseXml(option: ParseOptions): void;
   }