diff --git a/api/@ohos.data.preferences.d.ts b/api/@ohos.data.preferences.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..c5755371035728dbc700781e0828ffed10645373
--- /dev/null
+++ b/api/@ohos.data.preferences.d.ts
@@ -0,0 +1,199 @@
+/*
+* Copyright (c) 2022 Huawei Device Co., Ltd.
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+import { AsyncCallback, Callback } from './basic';
+import Context from "./application/Context";
+
+/**
+ * Provides interfaces to obtain and modify preferences data.
+ *
+ * @name preferences
+ * @since 8
+ * @syscap SystemCapability.DistributedDataManager.Preferences.Core
+ * 
+ */
+declare namespace preferences {
+    /**
+     * Obtains a {@link Preferences} instance matching a specified preferences file name.
+     *
+     * <p>The {@link references} instance loads all data of the preferences file and
+     * resides in the memory. You can use removePreferencesFromCache to remove the instance from the memory.
+     *
+     * @param context Indicates the context of application or capability.
+     * @param name Indicates the preferences file name.
+     * @return Returns the {@link Preferences} instance matching the specified preferences file name.
+     * @throws BusinessError if invoked failed
+     * @since 8
+     */
+    function getPreferences(context: Context, name: string, callback: AsyncCallback<Preferences>): void;
+    function getPreferences(context: Context, name: string): Promise<Preferences>;
+
+    /**
+     * Deletes a {@link Preferences} instance matching a specified preferences file name
+     * from the cache which is performed by removePreferencesFromCache and deletes the
+     * preferences file.
+     *
+     * <p>When deleting the {@link Preferences} instance, you must release all references
+     * of the instance. In addition, do not use the instance to perform data operations. Otherwise, data inconsistency
+     * will occur.
+     *
+     * @param context Indicates the context of application or capability.
+     * @param name Indicates the preferences file name.
+     * @throws BusinessError if invoked failed
+     * @since 8
+     */
+    function deletePreferences(context: Context, name: string, callback: AsyncCallback<void>): void;
+    function deletePreferences(context: Context, name: string): Promise<void>;
+
+    /**
+     * Deletes a {@link Preferences} instance matching a specified preferences file name
+     * from the cache.
+     *
+     * <p>When deleting the {@link Preferences} instance, you must release all references
+     * of the instance. In addition, do not use the instance to perform data operations. Otherwise, data inconsistency
+     * will occur.
+     *
+     * @param context Indicates the context of application or capability.
+     * @param name Indicates the preferences file name.
+     * @throws BusinessError if invoked failed
+     * @since 8
+     */
+    function removePreferencesFromCache(context: Context, name: string, callback: AsyncCallback<void>): void;
+    function removePreferencesFromCache(context: Context, name: string): Promise<void>;
+
+    /**
+     * Provides interfaces to obtain and modify preferences data.
+     *
+     * <p>The preferences data is stored in a file, which matches only one {@link Preferences} instance in the memory.
+     * You can use getPreferences to obtain the {@link Preferences} instance matching
+     * the file that stores preferences data, and use emovePreferencesFromCache
+     * to remove the {@link Preferences} instance from the memory.
+     *
+     * @syscap SystemCapability.DistributedDataManager.Preferences.Core
+     * 
+     * @since 8
+     */
+    interface Preferences {
+        /**
+        * Obtains the value of a preferences in the int format.
+        *
+        * <p>If the value is {@code null} or not in the int format, the default value is returned.
+        *
+        * @param key Indicates the key of the preferences. It cannot be {@code null} or empty.
+        * @param defValue Indicates the default value to return.
+        * @return Returns the value matching the specified key if it is found; returns the default value otherwise.
+        * @throws BusinessError if invoked failed
+        * @since 8
+        */
+        get(key: string, defValue: ValueType, callback: AsyncCallback<ValueType>): void;
+        get(key: string, defValue: ValueType): Promise<ValueType>;
+
+        /**
+         * Checks whether the {@link Preferences} object contains a preferences matching a specified key.
+         *
+         * @param key Indicates the key of the preferences to check for.
+         * @return Returns {@code true} if the {@link Preferences} object contains a preferences with the specified key;
+         * returns {@code false} otherwise.
+         * @throws BusinessError if invoked failed
+         * @since 8
+         */
+        has(key: string, callback: AsyncCallback<boolean>): boolean;
+        has(key: string): Promise<boolean>;
+
+        /**
+         * Sets an int value for the key in the {@link Preferences} object.
+         *
+         * <p>You can call the {@link #flush} method to save the {@link Preferences} object to the
+         * file.
+         *
+         * @param key Indicates the key of the preferences to modify. It cannot be {@code null} or empty.
+         * @param value Indicates the value of the preferences.
+         * <tt>MAX_KEY_LENGTH</tt>.
+         * @throws BusinessError if invoked failed
+         * @since 8
+         */
+        put(key: string, value: ValueType, callback: AsyncCallback<void>): void;
+        put(key: string, value: ValueType): Promise<void>;
+
+        /**
+         * Deletes the preferences with a specified key from the {@link Preferences} object.
+         *
+         * <p>You can call the {@link #flush} method to save the {@link Preferences} object to the
+         * file.
+         *
+         * @param key Indicates the key of the preferences to delete. It cannot be {@code null} or empty.
+         * <tt>MAX_KEY_LENGTH</tt>.
+         * @throws BusinessError if invoked failed
+         * @since 8
+         */
+        delete(key: string, callback: AsyncCallback<void>): void;
+        delete(key: string): Promise<void>;
+
+        /**
+         * Clears all preferences from the {@link Preferences} object.
+         *
+         * <p>You can call the {@link #flush} method to save the {@link Preferences} object to the
+         * file.
+         *
+         * @throws BusinessError if invoked failed
+         * @since 8
+         */
+        clear(callback: AsyncCallback<void>): void;
+        clear(): Promise<void>;
+
+        /**
+         * Asynchronously saves the {@link Preferences} object to the file.
+         *
+         * @throws BusinessError if invoked failed
+         * @since 8
+         */
+        flush(callback: AsyncCallback<void>): void;
+        flush(): Promise<void>;
+
+        /**
+         * Registers an observer to listen for the change of a {@link Preferences} object.
+         *
+         * @param callback Indicates the callback when preferences changes.
+         * @throws BusinessError if invoked failed
+         * @since 8
+         */
+        on(type: 'change', callback: Callback<{ key: string }>): void;
+
+        /**
+         * Unregisters an existing observer.
+         *
+         * @param callback Indicates the registered callback.
+         * @throws BusinessError if invoked failed
+         * @since 8
+         */
+        off(type: 'change', callback: Callback<{ key: string }>): void;
+    }
+
+    /**
+     * Indicates possible value types
+     */
+    type ValueType = number | string | boolean;
+
+    /**
+     * Indicates the maximum length of a key (80 characters).
+     */
+    const MAX_KEY_LENGTH: 80;
+
+    /**
+     * Indicates the maximum length of a string (8192 characters).
+     */
+    const MAX_VALUE_LENGTH: 8192;
+}
+
+export default preferences;
\ No newline at end of file
diff --git a/api/@ohos.data.storage.d.ts b/api/@ohos.data.storage.d.ts
index 10190d3808fe2cdc1d4ab1e511c6181f537527a5..15c6b1b06bf2673be05fc48f2944a56ac7512ee7 100644
--- a/api/@ohos.data.storage.d.ts
+++ b/api/@ohos.data.storage.d.ts
@@ -19,6 +19,7 @@ import { AsyncCallback, Callback } from './basic';
  *
  * @name storage
  * @since 5
+ * @deprecated since 8, please use @ohos.data.preferences instead.
  * @syscap SystemCapability.DistributedDataManager.Preferences.Core
  * 
  */
@@ -33,7 +34,9 @@ declare namespace storage {
      * @return Returns the {@link Storage} instance matching the specified storage file name.
      * @throws BusinessError if invoked failed
      * @since 5
+     * @deprecated since 8, please use @ohos.data.preferences instead.
      */
+
     function getStorageSync(path: string): Storage;
     function getStorage(path: string, callback: AsyncCallback<Storage>): void;
     function getStorage(path: string): Promise<Storage>;
@@ -50,6 +53,7 @@ declare namespace storage {
      * @param path Indicates the path of storage file
      * @throws BusinessError if invoked failed
      * @since 5
+     * @deprecated since 8, please use @ohos.data.preferences instead.
      */
     function deleteStorageSync(path: string): void;
     function deleteStorage(path: string, callback: AsyncCallback<void>): void;
@@ -66,6 +70,7 @@ declare namespace storage {
      * @param path Indicates the path of storage file.
      * @throws BusinessError if invoked failed
      * @since 5
+     * @deprecated since 8, please use @ohos.data.preferences instead.
      */
     function removeStorageFromCacheSync(path: string): void;
     function removeStorageFromCache(path: string, callback: AsyncCallback<void>): void;
@@ -82,6 +87,7 @@ declare namespace storage {
      * @syscap SystemCapability.DistributedDataManager.Preferences.Core
      * 
      * @since 5
+     * @deprecated since 8, please use @ohos.data.preferences instead.
      */
     interface Storage {
         /**
@@ -94,6 +100,7 @@ declare namespace storage {
         * @return Returns the value matching the specified key if it is found; returns the default value otherwise.
         * @throws BusinessError if invoked failed
         * @since 5
+        * @deprecated since 8, please use @ohos.data.preferences instead.
         */
         getSync(key: string, defValue: ValueType): ValueType;
         get(key: string, defValue: ValueType, callback: AsyncCallback<ValueType>): void;
@@ -107,6 +114,7 @@ declare namespace storage {
          * returns {@code false} otherwise.
          * @throws BusinessError if invoked failed
          * @since 5
+         * @deprecated since 8, please use @ohos.data.preferences instead.
          */
         hasSync(key: string): boolean;
         has(key: string, callback: AsyncCallback<boolean>): boolean;
@@ -123,6 +131,7 @@ declare namespace storage {
          * <tt>MAX_KEY_LENGTH</tt>.
          * @throws BusinessError if invoked failed
          * @since 5
+         * @deprecated since 8, please use @ohos.data.preferences instead.
          */
         putSync(key: string, value: ValueType): void;
         put(key: string, value: ValueType, callback: AsyncCallback<void>): void;
@@ -138,6 +147,7 @@ declare namespace storage {
          * <tt>MAX_KEY_LENGTH</tt>.
          * @throws BusinessError if invoked failed
          * @since 5
+         * @deprecated since 8, please use @ohos.data.preferences instead.
          */
         deleteSync(key: string): void;
         delete(key: string, callback: AsyncCallback<void>): void;
@@ -151,6 +161,7 @@ declare namespace storage {
          *
          * @throws BusinessError if invoked failed
          * @since 5
+         * @deprecated since 8, please use @ohos.data.preferences instead.
          */
         clearSync(): void;
         clear(callback: AsyncCallback<void>): void;
@@ -161,6 +172,7 @@ declare namespace storage {
          *
          * @throws BusinessError if invoked failed
          * @since 5
+         * @deprecated since 8, please use @ohos.data.preferences instead.
          */
         flushSync(): void;
         flush(callback: AsyncCallback<void>): void;
@@ -172,6 +184,7 @@ declare namespace storage {
          * @param callback Indicates the callback when storage changes.
          * @throws BusinessError if invoked failed
          * @since 5
+         * @deprecated since 8, please use @ohos.data.preferences instead.
          */
         on(type: 'change', callback: Callback<StorageObserver>): void;
 
@@ -181,6 +194,7 @@ declare namespace storage {
          * @param callback Indicates the registered callback.
          * @throws BusinessError if invoked failed
          * @since 5
+         * @deprecated since 8, please use @ohos.data.preferences instead.
          */
         off(type: 'change', callback: Callback<StorageObserver>): void;
     }
@@ -196,6 +210,7 @@ declare namespace storage {
      * @syscap SystemCapability.DistributedDataManager.Preferences.Core
      * 
      * @since 5
+     * @deprecated since 8, please use @ohos.data.preferences instead.
      */
     interface StorageObserver {
         /**