diff --git a/api/@ohos.inputmethod.d.ts b/api/@ohos.inputmethod.d.ts
index 44114b10f16b3386a8a409acc10bcc5d3362039f..2ec69c2eeb4b37a92c26744b2e753eb227fa02a3 100644
--- a/api/@ohos.inputmethod.d.ts
+++ b/api/@ohos.inputmethod.d.ts
@@ -19,7 +19,7 @@ import {AsyncCallback} from './basic';
  * inputmethod
  *
  * @since 6
- * @syscap SystemCapability.Miscservices.InputMethodFramework
+ * @syscap SystemCapability.MiscServices.InputMethodFramework
  */
 declare namespace inputMethod {
     const MAX_TYPE_NUM: number
diff --git a/api/@ohos.inputmethodengine.d.ts b/api/@ohos.inputmethodengine.d.ts
index 19b7beac09676a0fbd5cbecd3a9499c641069399..198a847fc244eb0e48e62d714ebede53d9af4d03 100644
--- a/api/@ohos.inputmethodengine.d.ts
+++ b/api/@ohos.inputmethodengine.d.ts
@@ -19,7 +19,7 @@ import {AsyncCallback} from './basic';
  * inputmethodengine
  *
  * @since 8
- * @syscap SystemCapability.Miscservices.InputMethodFramework
+ * @syscap SystemCapability.MiscServices.InputMethodFramework
  */
 declare namespace inputMethodEngine {
     const ENTER_KEY_TYPE_UNSPECIFIED: number;
@@ -68,9 +68,9 @@ declare namespace inputMethodEngine {
 
         off(type: 'inputStart', callback?: (kbController: KeyboardController, textInputClient: TextInputClient) => void): void;
 
-        on(type: 'keyboardShow|keyboardHide', callback: () => void): void;
+        on(type: 'keyboardShow'|'keyboardHide', callback: () => void): void;
 
-        off(type: 'keyboardShow|keyboardHide', callback?: () => void): void;
+        off(type: 'keyboardShow'|'keyboardHide', callback?: () => void): void;
     }
 
     interface TextInputClient {
@@ -94,21 +94,25 @@ declare namespace inputMethodEngine {
 
         getForward(length: number): Promise<string>;
 
+        getBackward(length: number, callback: AsyncCallback<string>): void;
+
+        getBackward(length: number): Promise<string>;
+
         getEditorAttribute(callback: AsyncCallback<EditorAttribute>): void;
 
         getEditorAttribute(): Promise<EditorAttribute>;
     }
 
     interface KeyboardDelegate {
-        on(type: 'keyDown|keyUp', callback: (event: KeyEvent) => boolean): void;
+        on(type: 'keyDown'|'keyUp', callback: (event: KeyEvent) => boolean): void;
 
-        off(type: 'keyDown|keyUp', callback?: (event: KeyEvent) => boolean): void;
+        off(type: 'keyDown'|'keyUp', callback?: (event: KeyEvent) => boolean): void;
 
         on(type: 'cursorContextChange', callback: (x: number, y: number, height: number) => void): void;
 
         off(type: 'cursorContextChange', callback?: (x: number, y: number, height: number) => void): void;
 
-        on(type: 'selectionChange', callback: (oldBegine: number, oldEnd: number, newBegine: number, newEnd: number) => void): void;
+        on(type: 'selectionChange', callback: (oldBegin: number, oldEnd: number, newBegin: number, newEnd: number) => void): void;
 
         off(type: 'selectionChange', callback?: (oldBegine: number, oldEnd: number, newBegine: number, newEnd: number) => void): void;