diff --git a/en/application-dev/reference/apis/js-apis-ability-context.md b/en/application-dev/reference/apis/js-apis-ability-context.md
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index 0000000000000000000000000000000000000000..5d85731dc2ee337581c5fa38d7d52d60170675d4
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+# AbilityContext
+
+> ![icon-note.gif](public_sys-resources/icon-note.gif) **Note:**
+> The initial APIs of this module are supported since API 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+
+
+Implements the ability context. This module is inherited from **Context**.
+
+
+## Attributes
+
+| Name| Type| Readable| Writable| Description| 
+| -------- | -------- | -------- | -------- | -------- |
+| abilityInfo | AbilityInfo | Yes| No| Ability information.| 
+| currentHapModuleInfo | HapModuleInfo | Yes| No| Information about the current HAP.| 
+
+
+## startAbility
+
+startAbility(want: Want, callback: AsyncCallback<void>): void
+
+Starts an ability. This method uses a callback to return the result.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | want | [Want](js-apis-featureAbility.md#Want)| Yes| Information about the **Want** used for starting an ability.| 
+  | callback | AsyncCallback<void> | Yes| Callback used to return the result.| 
+
+- Example
+  ```
+  var want = {
+  	"deviceId": "",
+  	"bundleName": "com.extreme.test",
+  	"abilityName": "com.extreme.test.MainAbility"
+  };
+  this.context.startAbility(want, (error) => {
+      console.log("error.code = " + error.code)
+  })
+  ```
+
+
+## startAbility
+
+startAbility(want: Want): Promise<void>;
+
+Starts an ability. This method uses a promise to return the result.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | want | [Want](js-apis-featureAbility.md#Want)| Yes| Information about the **Want** used for starting an ability.| 
+
+- Return value
+  | Type| Description| 
+  | -------- | -------- |
+  | Promise<void> | Promise used to return the result.| 
+
+- Example
+  ```
+  var want = {
+  	"deviceId": "",
+  	"bundleName": "com.extreme.test",
+  	"abilityName": "com.extreme.test.MainAbility"
+  };
+  this.context.startAbility(want)
+  .then((data) => {
+      console.log('Operation successful.')
+  }).catch((error) => {
+      console.log('Operation failed.');
+  })
+  ```
+
+
+## startAbilityForResult
+
+startAbilityForResult(want: Want, callback: AsyncCallback<AbilityResult>): void;
+
+Starts an ability. This method uses a callback to return the execution result when the ability is terminated.
+
+- Parameters
+  | Name| Type| Mandatory| Description|
+  | -------- | -------- | -------- | -------- |
+  | want |[Want](js-apis-featureAbility.md#Want)| Yes| Information about the **Want** used for starting an ability.|
+  | callback | Callback<[AbilityResult](js-apis-featureAbility.md#abilityresult)> | Yes| Callback used to return the result.|
+
+
+- Example
+  ```
+  this.context.startAbilityForResult(
+      {bundleName: "com.extreme.myapplication", abilityName: "MainAbilityDemo2"},
+      (error, result) => {
+          console.log("startAbilityForResult AsyncCallback is called, error.code = " + error.code)
+          console.log("startAbilityForResult AsyncCallback is called, result.resultCode = " + result.resultCode)
+       }
+  );
+  ```
+
+
+## startAbilityForResult
+
+startAbilityForResult(want: Want): Promise<AbilityResult>;
+
+Starts an ability. This method uses a promise to return the execution result when the ability is terminated.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | want | [Want](js-apis-featureAbility.md#Want)| Yes| Information about the **Want** used for starting an ability.| 
+
+- Return value
+  | Type| Description|
+  | -------- | -------- |
+  | Promise<[AbilityResult](js-apis-featureAbility.md#abilityresult)> | Promise used to return the result.|
+
+- Example
+  ```
+  this.context.startAbilityForResult({bundleName: "com.extreme.myapplication", abilityName: "MainAbilityDemo2"}).then((result) => {
+      console.log("startAbilityForResult Promise.resolve is called, result.resultCode = " + result.resultCode)
+  }, (error) => {
+      console.log("startAbilityForResult Promise.Reject is called, error.code = " + error.code)
+  })
+  ```
+
+
+## terminateSelf
+
+terminateSelf(callback: AsyncCallback<void>): void;
+
+Terminates this ability. This method uses a callback to return the result.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | callback | AsyncCallback<void> | No| Callback used to return the result indicating whether the method is successfully called.| 
+
+- Example
+  ```
+  this.context.terminateSelf((err) => {
+      console.log('terminateSelf result:' + JSON.stringfy(err);
+  }
+  ```
+
+
+## terminateSelf
+
+terminateSelf(): Promise<void>;
+
+Terminates this ability. This method uses a promise to return the result.
+
+- Return value
+  | Type| Description| 
+  | -------- | -------- |
+  | Promise<void> | Promise used to return the result indicating whether the method is successfully called.| 
+
+- Example
+  ```
+  this.context.terminateSelf(want).then((data) => {
+      console.log('success:' + JSON.stringfy(data));
+  )).catch((error) => {
+      console.log('failed:' + JSON.stringfy(error));
+  });
+  ```
+
+
+## terminateSelfWithResult
+
+terminateSelfWithResult(parameter: AbilityResult, callback: AsyncCallback<void>): void;
+
+Terminates this ability. This method uses a callback to return the information to the caller of **startAbilityForResult**.
+
+- Parameters
+  | Name| Type| Mandatory| Description|
+  | -------- | -------- | -------- | -------- |
+  | parameter | [AbilityResult](js-apis-featureAbility.md#abilityresult) | Yes| Information returned to the caller.|
+  | callback | Callback<void> | No| Callback used to return the information.|
+
+- Example
+  ```
+  this.context.terminateSelfWithResult(
+     {
+          want: {bundleName: "com.extreme.myapplication", abilityName: "MainAbilityDemo"},
+          resultCode: 100
+      }, (error) => {
+          console.log("terminateSelfWithResult is called = " + error.code)
+      }
+  );
+  ```
+
+
+## terminateSelfWithResult
+
+terminateSelfWithResult(parameter: AbilityResult): Promise<void>;
+
+Terminates this ability. This method uses a promise to return information to the caller of **startAbilityForResult**.
+
+- Parameters
+  | Name| Type| Mandatory| Description|
+  | -------- | -------- | -------- | -------- |
+  | parameter | [AbilityResult](js-apis-featureAbility.md#abilityresult) | Yes| Information returned to the caller.|
+
+- Return value
+  | Type| Description| 
+  | -------- | -------- |
+  | Promise<void> | Promise used to return the result.| 
+
+- Example
+  ```
+  this.context.terminateSelfWithResult(
+  {
+      want: {bundleName: "com.extreme.myapplication", abilityName: "MainAbilityDemo"},
+      resultCode: 100
+  }).then((result) => {
+      console.log("terminateSelfWithResult")
+  }
+  )
+  ```
diff --git a/en/application-dev/reference/apis/js-apis-extension-context.md b/en/application-dev/reference/apis/js-apis-extension-context.md
new file mode 100644
index 0000000000000000000000000000000000000000..be430dce1a7275fd27d7c387199c0d353b8e8d02
--- /dev/null
+++ b/en/application-dev/reference/apis/js-apis-extension-context.md
@@ -0,0 +1,14 @@
+# ExtensionContext
+
+> ![icon-note.gif](public_sys-resources/icon-note.gif) **Note:**
+> The initial APIs of this module are supported since API 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+
+
+Implements the extension context. This module is inherited from **Context**.
+
+
+## Attributes
+
+| Name| Type| Readable| Writable| Description| 
+| -------- | -------- | -------- | -------- | -------- |
+| currentHapModuleInfo | HapModuleInfo | Yes| No| Information about the current HAP.| 
diff --git a/en/application-dev/reference/apis/js-apis-service-extension-context.md b/en/application-dev/reference/apis/js-apis-service-extension-context.md
new file mode 100644
index 0000000000000000000000000000000000000000..fa46ef6df13d0e7bd7b4c8dd788fbe4184417488
--- /dev/null
+++ b/en/application-dev/reference/apis/js-apis-service-extension-context.md
@@ -0,0 +1,193 @@
+# ServiceExtensionContext
+
+> ![icon-note.gif](public_sys-resources/icon-note.gif) **Note:**
+> The initial APIs of this module are supported since API 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+
+
+Implements the context that provides the capabilities and APIs of **ServiceExtension**. This class is inherited from **ExtensionContext**.
+
+
+## startAbility
+
+
+startAbility(want: Want, callback: AsyncCallback<void>): void;
+
+
+Starts an ability. This method uses a callback to return the result.
+
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | want | [Want](js-apis-featureAbility.md#Want)| Yes| Information about the ability to start, such as the ability name and bundle name.| 
+  | callback | AsyncCallback<void> | No| Callback used to return the result indicating whether the method is successfully called.| 
+
+- Example
+  ```
+  let want = {
+      "bundleName": "com.example.myapp",
+      "abilityName": "com.example.myapp.MyAbility"
+  };
+  this.context.startAbility(want, (err) => {
+      console.log('startAbility result:' + JSON.stringfy(err);
+  }  
+  ```
+
+
+## startAbility
+
+startAbility(want: Want): Promise<void>;
+
+Starts an ability. This method uses a promise to return the result.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | want | [Want](js-apis-featureAbility.md#Want)| Yes| Information about the ability to start, such as the ability name and bundle name.| 
+
+- Return value
+  | Type| Description| 
+  | -------- | -------- |
+  | Promise<void> | Promise used to return the result indicating whether the method is successfully called.| 
+
+- Example
+  ```
+  let want = {
+      "bundleName": "com.example.myapp",
+      "abilityName": "com.example.myapp.MyAbility"
+  };
+  this.context.startAbility(want).then((data) => {
+      console.log('success:' + JSON.stringfy(data));
+  )).catch((error) => {
+      console.log('failed:' + JSON.stringfy(error));
+  });
+  ```
+
+
+## terminateSelf
+
+terminateSelf(callback: AsyncCallback<void>): void;
+
+Terminates this ability. This method uses a callback to return the result.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | callback | AsyncCallback<void> | No| Callback used to return the result indicating whether the method is successfully called.| 
+
+- Example
+  ```
+  this.context.terminateSelf((err) => {
+      console.log('terminateSelf result:' + JSON.stringfy(err);
+  }
+  ```
+
+
+## terminateSelf
+
+terminateSelf(): Promise<void>;
+
+Terminates this ability. This method uses a promise to return the result.
+
+- Return value
+  | Type| Description| 
+  | -------- | -------- |
+  | Promise<void> | Promise used to return the result indicating whether the method is successfully called.| 
+
+- Example
+  ```
+  this.context.terminateSelf(want).then((data) => {
+      console.log('success:' + JSON.stringfy(data));
+  )).catch((error) => {
+      console.log('failed:' + JSON.stringfy(error));
+  });
+  ```
+
+
+## connectAbility
+
+connectAbility(want: Want, options: ConnectOptions): number;
+
+Connects this ability to a Service ability.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | want | [Want](js-apis-featureAbility.md#Want)| Yes| Information about the ability to connect to, such as the ability name and bundle name.| 
+  | options | [ConnectOptions](#connectoptions) | Yes| Callback used to return the information indicating that the connection is successful, interrupted, or failed.| 
+
+- Return value
+  | Type| Description| 
+  | -------- | -------- |
+  | number | A number, based on which the connection will be interrupted.| 
+
+- Example
+  ```
+  let want = {
+      "bundleName": "com.example.myapp",
+      "abilityName": "com.example.myapp.MyAbility"
+  };
+  let options = {
+      onConnect: function(elementName, proxy) {}
+      onDisConnect: function(elementName) {}
+      onFailed: function(code) {}
+  }
+  let connection = this.context.connectAbility(want,options);
+  ```
+
+
+## disconnectAbility
+
+disconnectAbility(connection: number, callback:AsyncCallback<void>): void;
+
+Disconnects this ability from the Service ability. This method uses a callback to return the result.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | connection | number | Yes| Number returned after **connectAbility** is called.| 
+  | callback | AsyncCallback<void> | No| Callback used to return the result indicating whether the method is successfully called.| 
+
+- Example
+  ```
+  this.context.disconnectAbility(connection, (err) => { // connection is the return value of connectAbility.
+      console.log('terminateSelf result:' + JSON.stringfy(err);
+  }
+  ```
+
+
+## disconnectAbility
+
+disconnectAbility(connection: number): Promise<void>;
+
+Disconnects this ability from the Service ability. This method uses a promise to return the result.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | connection | number | Yes| Number returned after **connectAbility** is called.| 
+
+- Return value
+  | Type| Description| 
+  | -------- | -------- |
+  | Promise<void> | Promise used to return the result indicating whether the method is successfully called.| 
+
+- Example
+  ```
+  this.context.disconnectAbility(connection).then((data) => { // connection is the return value of connectAbility.
+      console.log('success:' + JSON.stringfy(data));
+  )).catch((error) => {
+      console.log('failed:' + JSON.stringfy(error));
+  });
+  ```
+
+
+## ConnectOptions
+
+Defines the **ConnectOptions** data structure.
+
+| Name| Description| 
+| -------- | -------- |
+| onConnect(elementName:ElementName, remote:IRemoteObject) | Called when this ability is connected to a Service ability.| 
+| onDisconnect(elementName:ElementName) | Called when the peer service is abnormal or killed.| 
+| onFailed(code: number) | Called when the connection fails.| 
diff --git a/en/application-dev/reference/apis/js-apis-service-extension.md b/en/application-dev/reference/apis/js-apis-service-extension.md
new file mode 100644
index 0000000000000000000000000000000000000000..22f46948c07041a90488fef30df310ddb2f1294f
--- /dev/null
+++ b/en/application-dev/reference/apis/js-apis-service-extension.md
@@ -0,0 +1,133 @@
+# ServiceExtension
+
+> ![icon-note.gif](public_sys-resources/icon-note.gif) **Note:**
+> The initial APIs of this module are supported since API 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+
+
+Provides APIs related to **ServiceExtension**.
+
+
+## Modules to Import
+
+```
+import ServiceExtension from '@ohos.application.ServiceExtension';
+```
+
+
+## Required Permissions
+
+None
+
+
+## Attributes
+
+| Name| Type| Readable| Writable| Description| 
+| -------- | -------- | -------- | -------- | -------- |
+| context | [ServiceExtensionContext](js-apis-service-extension-context.md)  | Yes| No| Service extension context, which is inherited from **ExtensionContext**.| 
+
+
+## onCreate
+
+onCreate(want: Want): void;
+
+Called when an extension is created to initialize the service logic.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | want |  [Want](js-apis-featureAbility.md#Want)| Yes| Information related to this extension, including the ability name and bundle name.| 
+
+- Example
+  ```
+  onCreate(want) {
+      console.log('onCreate, want:' + want.abilityName);
+  }
+  ```
+
+
+## onDestroy
+
+onDestroy(): void;
+
+Called when this extension is destroyed to clear resources.
+
+- Example
+  ```
+  onDestroy() {
+      console.log('onDestroy');
+      destory();
+  }
+  ```
+
+
+## onRequest
+
+onRequest(want: Want, startId: number): void;
+
+Called after **onCreate** is invoked when an ability is started by calling **startAbility**. The value of **startId** is incremented for each ability that is started.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | want |  [Want](js-apis-featureAbility.md#Want)| Yes| Information related to this extension, including the ability name and bundle name.| 
+  | startId | number | Yes| Number of ability start times. The initial value is **1**, and the value is automatically incremented for each ability started.| 
+
+- Example
+  ```
+  onRequest(want: Want, startId: number) {
+      console.log('onRequest, want:' + want.abilityName);
+  }
+  ```
+
+
+## onConnect
+
+onConnect(want: Want): rpc.RemoteObject;
+
+Called after **onCreate** is invoked when an ability is started by calling **connectAbility**. A **RemoteObject** object is returned for communication with the client.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | want |  [Want](js-apis-featureAbility.md#Want)| Yes| Information related to this extension, including the ability name and bundle name.| 
+
+- Return value
+  | Type| Description| 
+  | -------- | -------- |
+  | rpc.RemoteObject | A **RemoteObject** object used for communication with the client.| 
+
+- Example
+  ```
+  import rpc from '@ohos.rpc'
+  class StubTest extends rpc.RemoteObject{
+      constructor(des) {
+          super(des);
+      }
+      onRemoteRequest(code, data, reply, option) {
+      }
+  }
+  ...
+  onConnect(want) {
+      console.log('onConnect , want:' + want.abilityName);
+      return new StubTest("test");
+  }
+  ```
+
+
+## onDisconnect
+
+onDisconnect(want: Want): void;
+
+Called when the ability is disconnected.
+
+- Parameters
+  | Name| Type| Mandatory| Description| 
+  | -------- | -------- | -------- | -------- |
+  | want |[Want](js-apis-featureAbility.md#Want)| Yes| Information related to this extension, including the ability name and bundle name.| 
+
+- Example
+  ```
+  onDisconnect(want) {
+      console.log('onDisconnect, want:' + want.abilityName);
+  }
+  ```