diff --git a/api/@ohos.application.WindowExtensionAbility.d.ts b/api/@ohos.application.WindowExtensionAbility.d.ts
index 3d282928e89bc873376df85cc5ef396506485b60..fe5280f0d4c630f8e9bf8a0f8cf3a5f812afd3a5 100644
--- a/api/@ohos.application.WindowExtensionAbility.d.ts
+++ b/api/@ohos.application.WindowExtensionAbility.d.ts
@@ -14,7 +14,7 @@
  */
 
 import rpc from "./@ohos.rpc";
-import ExtensionContext from "./application/ExtensionContext";
+import WindowExtensionContext from "./application/WindowExtensionContext";
 import Want from './@ohos.app.ability.Want';
 import window from './@ohos.window';
 
@@ -35,7 +35,7 @@ export default class WindowExtensionAbility {
      * @systemapi hide for inner use.
      * @StageModelOnly
      */
-    context: ExtensionContext;
+    context: WindowExtensionContext;
 
     /**
      * Called back when a window extension is first connected to an ability.
diff --git a/api/application/WindowExtensionContext.d.ts b/api/application/WindowExtensionContext.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..3b28a2312cd8e7ccb68cd00c559fa58279776581
--- /dev/null
+++ b/api/application/WindowExtensionContext.d.ts
@@ -0,0 +1,55 @@
+/*
+ * 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 } from "../basic";
+import ExtensionContext from "./ExtensionContext";
+import Want from "../@ohos.application.Want";
+import StartOptions from "../@ohos.app.ability.StartOptions";
+
+/**
+ * The context of window extension. It allows access to
+ * windowExtension-specific resources.
+ * @syscap SystemCapability.WindowManager.WindowManager.Core
+ * @systemapi
+ * @stagemodelonly
+ * @since 9
+ */
+export default class WindowExtensionContext extends ExtensionContext {
+    /**
+     * Window extension uses this method to start a specific ability.
+     * @param { Want } want - Indicates the ability to start.
+     * @param { StartOptions } options - Indicates the start options.
+     * @param { AsyncCallback<void> } callback - The callback of startAbility.
+     * @throws { BusinessError } 401 - If the input parameter is not valid parameter.
+     * @syscap SystemCapability.WindowManager.WindowManager.Core
+     * @systemapi
+     * @stagemodelonly
+     * @since 9
+     */
+    startAbility(want: Want, options: StartOptions, callback: AsyncCallback<void>): void;
+
+    /**
+     * Window extension uses this method to start a specific ability.
+     * @param { Want } want - Indicates the ability to start.
+     * @param { StartOptions } options - Indicates the start options.
+     * @returns { Promise<void> } The promise returned by the function.
+     * @throws { BusinessError } 401 - If the input parameter is not valid parameter.
+     * @syscap SystemCapability.WindowManager.WindowManager.Core
+     * @systemapi
+     * @stagemodelonly
+     * @since 9
+     */
+    startAbility(want: Want, options?: StartOptions): Promise<void>;
+}
\ No newline at end of file