diff --git a/api/@ohos.multimedia.avsession.d.ts b/api/@ohos.multimedia.avsession.d.ts
index 142c9518492fa4b8fb78ef452c57cc3b4a1c34a3..1f635d348a7a22ac05ce163ed45954db2533645f 100644
--- a/api/@ohos.multimedia.avsession.d.ts
+++ b/api/@ohos.multimedia.avsession.d.ts
@@ -837,7 +837,7 @@ declare namespace avSession {
    * This function can be used at both side to get the same controller to do the playback control.
    * @permission ohos.permission.MANAGE_MEDIA_RESOURCES
    * @param { string } sessionId Specifies the sessionId to get controller.
-   * @param { AsyncCallback<AVCastController> } callback - async callback for the AVCastController.
+   * @param { AsyncCallback<AVCastController | undefined> } callback - async callback for the AVCastController.
    * @throws {BusinessError} 201 - permission denied
    * @throws { BusinessError } 202 - Not System App.
    * @throws { BusinessError } 401 - parameter check failed. 1.Mandatory parameters are left unspecified.
@@ -849,14 +849,14 @@ declare namespace avSession {
    * @since arkts {'1.1':'10','1.2':'20'}
    * @arkts 1.1&1.2
    */
-  function getAVCastController(sessionId: string, callback: AsyncCallback<AVCastController>): void;
+  function getAVCastController(sessionId: string, callback: AsyncCallback<AVCastController | undefined>): void;
 
   /**
    * Get the current session's remote controller client.
-   * If the avsession is not under casting state, the controller will return null.
+   * If the avsession is not under casting state, the controller will return undefined.
    * @permission ohos.permission.MANAGE_MEDIA_RESOURCES
    * @param { string } sessionId Specifies the sessionId to get controller.
-   * @returns { Promise<AVCastController> } Promise for the AVCastController
+   * @returns { Promise<AVCastController | undefined> } Promise for the AVCastController
    * @throws {BusinessError} 201 - permission denied
    * @throws { BusinessError } 202 - Not System App.
    * @throws { BusinessError } 401 - parameter check failed. 1.Mandatory parameters are left unspecified.
@@ -868,7 +868,7 @@ declare namespace avSession {
    * @since arkts {'1.1':'10','1.2':'20'}
    * @arkts 1.1&1.2
    */
-  function getAVCastController(sessionId: string): Promise<AVCastController>;
+  function getAVCastController(sessionId: string): Promise<AVCastController | undefined>;
 
   /**
    * Cast resource to remote device.
@@ -1598,15 +1598,15 @@ declare namespace avSession {
 
     /**
      * Get the cast controller when the session is casted to remote device.
-     * If the avsession is not under casting state, the controller will return null.
-     * @param { AsyncCallback<AVCastController> } callback - async callback for the AVCastController.
+     * If the avsession is not under casting state, the controller will return undefined.
+     * @param { AsyncCallback<AVCastController | undefined> } callback - async callback for the AVCastController.
      * @throws {BusinessError} 6600102 - The session does not exist
      * @throws {BusinessError} 6600109 - The remote connection is not established
      * @syscap SystemCapability.Multimedia.AVSession.AVCast
      * @since arkts {'1.1':'10','1.2':'20'}
      * @arkts 1.1&1.2
      */
-    getAVCastController(callback: AsyncCallback<AVCastController>): void;
+    getAVCastController(callback: AsyncCallback<AVCastController | undefined>): void;
 
     /**
      * Get the cast controller when the session is casted to remote device.
@@ -1619,8 +1619,8 @@ declare namespace avSession {
      */
     /**
      * Get the cast controller when the session is casted to remote device.
-     * If the avsession is not under casting state, the controller will return null.
-     * @returns { Promise<AVCastController> } Promise for the AVCastController
+     * If the avsession is not under casting state, the controller will return undefined.
+     * @returns { Promise<AVCastController | undefined> } Promise for the AVCastController
      * @throws {BusinessError} 6600102 - The session does not exist
      * @throws {BusinessError} 6600109 - The remote connection is not established
      * @syscap SystemCapability.Multimedia.AVSession.AVCast
@@ -1628,7 +1628,7 @@ declare namespace avSession {
      * @since arkts {'1.1':'12','1.2':'20'}
      * @arkts 1.1&1.2
      */
-    getAVCastController(): Promise<AVCastController>;
+    getAVCastController(): Promise<AVCastController | undefined>;
 
     /**
      * Get output device information