diff --git a/api/application/AbilityStartCallback.d.ts b/api/application/AbilityStartCallback.d.ts
index b307905ed1bd46cd3b0dc54a329cb8d23c6b389b..5e9ca4d75b5b4bfafd7fb4a9dd8e8eb6befdfe82 100644
--- a/api/application/AbilityStartCallback.d.ts
+++ b/api/application/AbilityStartCallback.d.ts
@@ -18,19 +18,22 @@
  * @kit AbilityKit
  */
 
-/*** if arkts 1.1 */
 import type { AbilityResult } from '../ability/abilityResult';
+/*** if arkts 1.1 */
+import { int } from '../@ohos.base';
 /*** endif */
 
 /**
  * The callback of UIAbility or UIExtensionAbility.
+ * 
+ * @typedef AbilityStartCallback
  * @syscap SystemCapability.Ability.AbilityRuntime.Core
  * @stagemodelonly
  * @atomicservice
  * @since arkts {'1.1':'11', '1.2':'20'}
  * @arkts 1.1&1.2
  */
-declare class AbilityStartCallback {
+declare interface AbilityStartCallback {
 
   /**
    * Called when some error occurred except disconnected from UIAbility or UIExtensionAbility.
@@ -41,9 +44,10 @@ declare class AbilityStartCallback {
    * @syscap SystemCapability.Ability.AbilityRuntime.Core
    * @stagemodelonly
    * @atomicservice
-   * @since 11
+   * @since arkts {'1.1':'11', '1.2':'20'}
+   * @arkts 1.1&1.2
    */
-  onError(code: number, name: string, message: string): void;
+  onError(code: int, name: string, message: string): void;
   
   /**
    * Called when UIExtensionAbility terminate with result.
@@ -55,6 +59,18 @@ declare class AbilityStartCallback {
    * @since 12
    */
   onResult?(parameter: AbilityResult): void;
+
+  /**
+   * Called when UIExtensionAbility terminate with result.
+   *
+   * @param { AbilityResult } parameter - The parameter returned if the UIExtensionAbility call terminateSelfWithResult.
+   * @syscap SystemCapability.Ability.AbilityRuntime.Core
+   * @stagemodelonly
+   * @atomicservice
+   * @since 20
+   * @arkts 1.2
+   */
+  onResult?:(parameter: AbilityResult)=> void;
 }
 
 export default AbilityStartCallback;
\ No newline at end of file