diff --git a/api/@ohos.app.ability.CompletionHandler.d.ts b/api/@ohos.app.ability.CompletionHandler.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..2499461a6ba44c1e26cb22b6bda316ff17d14ef1
--- /dev/null
+++ b/api/@ohos.app.ability.CompletionHandler.d.ts
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2025 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.
+ */
+
+/**
+ * @file
+ * @kit AbilityKit
+ */
+
+import { ElementName } from "./bundleManager/ElementName";
+
+/**
+ * CompletionHandler is a handler to handle the completion events of start ability.
+ *
+ * @syscap SystemCapability.Ability.AbilityRuntime.Core
+ * @stagemodelonly
+ * @atomicservice
+ * @since 20
+ */
+export default class CompletionHandler {
+  /**
+   * Notify the success result of startAbility.
+   *
+   * @param { ElementName } elementName - Indicates the component to start.
+   * @param { string } message - Indicates the message of the request result.
+   * @syscap SystemCapability.Ability.AbilityRuntime.Core
+   * @stagemodelonly
+   * @atomicservice
+   * @since 20
+   */
+  onRequestSuccess(elementName: ElementName, message: string): void;
+
+  /**
+   * Notify the failure result of startAbility.
+   *
+   * @param { ElementName } elementName - Indicates the component to start.
+   * @param { string } message - Indicates the message of the request result.
+   * @syscap SystemCapability.Ability.AbilityRuntime.Core
+   * @stagemodelonly
+   * @atomicservice
+   * @since 20
+   */
+  onRequestFailure(elementName: ElementName, message: string): void;
+}
\ No newline at end of file
diff --git a/api/@ohos.app.ability.StartOptions.d.ts b/api/@ohos.app.ability.StartOptions.d.ts
index 89c77749b59eca51e03a4615b8627d284540a897..f924b299385207416853c516ea180505a13aefae 100644
--- a/api/@ohos.app.ability.StartOptions.d.ts
+++ b/api/@ohos.app.ability.StartOptions.d.ts
@@ -21,6 +21,7 @@
 import contextConstant from "./@ohos.app.ability.contextConstant";
 import image from "./@ohos.multimedia.image";
 import bundleManager from './@ohos.bundle.bundleManager';
+import CompletionHandler from "./@ohos.app.ability.CompletionHandler";
 
 /**
  * StartOptions is the basic communication component of the system.
@@ -224,4 +225,15 @@ export default class StartOptions {
    * @since 18
    */
   maxWindowHeight?: number;
+
+  /**
+   * The completion handler of StartAbility.
+   *
+   * @type { ?CompletionHandler }
+   * @syscap SystemCapability.Ability.AbilityRuntime.Core
+   * @stagemodelonly
+   * @atomicservice
+   * @since 20
+   */
+  completionHandler?: CompletionHandler;
 }
\ No newline at end of file
diff --git a/build-tools/dts_parser/kit.json b/build-tools/dts_parser/kit.json
index dfe42871f2eb892da4e60ad2afa359cfe14552f2..2f8cf4dc0789b12b5fa1ce1879494691649792e0 100644
--- a/build-tools/dts_parser/kit.json
+++ b/build-tools/dts_parser/kit.json
@@ -251,6 +251,7 @@
     },
     { "filePath": "@ohos.application.appManager.d.ts", "kitName": "AbilityKit", "subSystem": "元能力" },
     { "filePath": "@ohos.application.BackupExtensionAbility.d.ts", "kitName": "CoreFileKit", "subSystem": "文件管理" },
+    { "filePath": "@ohos.application.CompletionHandler.d.ts", "kitName": "AbilityKit", "subSystem": "元能力" },
     { "filePath": "@ohos.application.Configuration.d.ts", "kitName": "AbilityKit", "subSystem": "元能力" },
     { "filePath": "@ohos.application.ConfigurationConstant.d.ts", "kitName": "AbilityKit", "subSystem": "元能力" },
     {