diff --git a/zh-cn/application-dev/file-management/app-file-access.md b/zh-cn/application-dev/file-management/app-file-access.md
index e7924858d1033f6231df862bade0a22de13c673a..eb3e5e4cdb3bc679242fef8f6fa0805cc9a9315a 100644
--- a/zh-cn/application-dev/file-management/app-file-access.md
+++ b/zh-cn/application-dev/file-management/app-file-access.md
@@ -46,8 +46,9 @@
 // pages/xxx.ets
 import fs from '@ohos.file.fs';
 import common from '@ohos.app.ability.common';
+import buffer from '@ohos.buffer';
 
-function createFile() {
+createFile() {
   // 获取应用文件路径
   let context = getContext(this) as common.UIAbilityContext;
   let filesDir = context.filesDir;
@@ -58,9 +59,10 @@ function createFile() {
   let writeLen = fs.writeSync(file.fd, "Try to write str.");
   console.info("The length of str is: " + writeLen);
   // 从文件读取一段内容
-  let buf = new ArrayBuffer(1024);
-  let readLen = fs.readSync(file.fd, buf, { offset: 0 });
-  console.info("the content of file: " + String.fromCharCode.apply(null, new Uint8Array(buf.slice(0, readLen))));
+  let arrayBuffer = new ArrayBuffer(1024);
+  let readLen = fs.readSync(file.fd, arrayBuffer, { offset: 0 });
+  let buf = buffer.from(arrayBuffer, 0, readLen);
+  console.info("the content of file: " + buf.toString());
   // 关闭文件
   fs.closeSync(file);
 }
@@ -75,7 +77,7 @@ function createFile() {
 import fs from '@ohos.file.fs';
 import common from '@ohos.app.ability.common';
 
-function readWriteFile() {
+readWriteFile() {
   // 获取应用文件路径
   let context = getContext(this) as common.UIAbilityContext;
   let filesDir = context.filesDir;
@@ -112,7 +114,7 @@ function readWriteFile() {
 import fs from '@ohos.file.fs';
 import common from '@ohos.app.ability.common';
 
-async function readWriteFileWithStream() {
+async readWriteFileWithStream() {
   // 获取应用文件路径
   let context = getContext(this) as common.UIAbilityContext;
   let filesDir = context.filesDir;
@@ -147,7 +149,7 @@ async function readWriteFileWithStream() {
 
 ```ts
 // 查看文件列表
-import fs from '@ohos.file.fs';
+import fs, { Filter } from '@ohos.file.fs';
 import common from '@ohos.app.ability.common';
 
 // 获取应用文件路径
@@ -155,18 +157,20 @@ let context = getContext(this) as common.UIAbilityContext;
 let filesDir = context.filesDir;
 
 // 查看文件列表
-let options = {
-  recursion: false,
-  listNum: 0,
-  filter: {
+getListFile() {
+  let filter: Filter = {
     suffix: ['.png', '.jpg', '.txt'],          // 匹配文件后缀名为'.png','.jpg','.txt'
     displayName: ['test%'],                    // 匹配文件全名以'test'开头
     fileSizeOver: 0,                           // 匹配文件大小大于等于0
     lastModifiedAfter: new Date(0).getTime(),  // 匹配文件最近修改时间在1970年1月1日之后
-  },
-}
-let files = fs.listFileSync(filesDir, options);
-for (let i = 0; i < files.length; i++) {
-  console.info(`The name of file: ${files[i]}`);
+  }
+  let files = fs.listFileSync(filesDir, {
+    recursion: false,
+    listNum: 0,
+    filter: filter
+  });
+  for (let i = 0; i < files.length; i++) {
+    console.info(`The name of file: ${files[i]}`);
+  }
 }
 ```
diff --git a/zh-cn/application-dev/file-management/app-file-backup.md b/zh-cn/application-dev/file-management/app-file-backup.md
index 7b8eb451978a70db57e4905d9a93da92e9d11ad0..1928f6c4366748687bfa46702876d96b91ec5d29 100644
--- a/zh-cn/application-dev/file-management/app-file-backup.md
+++ b/zh-cn/application-dev/file-management/app-file-backup.md
@@ -32,7 +32,7 @@
 
 调用`backup.getLocalCapabilities()`获取能力文件。
 
- ```js
+ ```ts
   import fs from '@ohos.file.fs';
   async function getLocalCapabilities() {
     try {
@@ -89,16 +89,21 @@
 
  ```ts
   import fs from '@ohos.file.fs';
+  import common from '@ohos.app.ability.common';
+  import { BusinessError } from '@ohos.base';
+
+  let context = getContext(this) as common.UIAbilityContext;
+  let filesDir = context.filesDir;
   // 创建SessionBackup类的实例用于备份数据
-  let g_session;
-  function createSessionBackup() {
+  let g_session: backup.SessionBackup;
+  createSessionBackup() {
     let sessionBackup = new backup.SessionBackup({
-      onFileReady: async (err, file) => {
+      onFileReady: (err: BusinessError, file: backup.File) => {
         if (err) {
           console.info('onFileReady err: ' + err);
         }
         try {
-          let bundlePath = await globalThis.context.filesDir + '/' + file.bundleName;
+          let bundlePath = filesDir + '/' + file.bundleName;
           if (!fs.accessSync(bundlePath)) {
             fs.mkdirSync(bundlePath);
           }
@@ -109,21 +114,21 @@
           console.error('onFileReady failed with err: ' + e);
         }
       },
-      onBundleBegin: (err, bundleName) => {
+      onBundleBegin: (err: BusinessError, bundleName: string) => {
         if (err) {
           console.info('onBundleBegin err: ' + err);
         } else {
           console.info('onBundleBegin bundleName: ' + bundleName);
         }
       },
-      onBundleEnd: (err, bundleName) => {
+      onBundleEnd: (err: BusinessError, bundleName: string) => {
         if (err) {
           console.info('onBundleEnd err: ' + err);
         } else {
           console.info('onBundleEnd bundleName: ' + bundleName);
         }
       },
-      onAllBundlesEnd: (err) => {
+      onAllBundlesEnd: (err: BusinessError) => {
         if (err) {
           console.info('onAllBundlesEnd err: ' + err);
         } else {
@@ -137,12 +142,11 @@
     return sessionBackup;
   }
   
-  async function sessionBackup ()
-  {
+  async sessionBackup () {
     g_session = createSessionBackup();
     // 此处可根据backup.getLocalCapabilities()提供的能力文件，选择需要备份的应用
     // 也可直接根据应用包名称进行备份
-    const backupApps = [
+    const backupApps: string[] = [
       "com.example.hiworld",
     ]
     await g_session.appendBundles(backupApps);
@@ -163,22 +167,21 @@
  ```ts
   import fs from '@ohos.file.fs';
   // 创建SessionRestore类的实例用于恢复数据
-  let g_session;
-  async function publishFile(file)
-  {
+  let g_session: backup.SessionRestore;
+  async publishFile(file: backup.File) {
     await g_session.publishFile({
       bundleName: file.bundleName,
       uri: file.uri
     });
   }
-  function createSessionRestore() {
+  createSessionRestore() {
     let sessionRestore = new backup.SessionRestore({
-      onFileReady: (err, file) => {
+      onFileReady: (err: BusinessError, file: backup.File) => {
         if (err) {
           console.info('onFileReady err: ' + err);
         }
         // 此处开发者请根据实际场景待恢复文件存放位置进行调整 bundlePath
-        let bundlePath;
+        let bundlePath: string;
         if (!fs.accessSync(bundlePath)) {
           console.info('onFileReady bundlePath err : ' + bundlePath);
         }
@@ -188,19 +191,19 @@
         publishFile(file);
         console.info('onFileReady success');
       },
-      onBundleBegin: (err, bundleName) => {
+      onBundleBegin: (err: BusinessError, bundleName: string) => {
         if (err) {
           console.error('onBundleBegin failed with err: ' + err);
         }
         console.info('onBundleBegin success');
       },
-      onBundleEnd: (err, bundleName) => {
+      onBundleEnd: (err: BusinessError, bundleName: string) => {
         if (err) {
           console.error('onBundleEnd failed with err: ' + err);
         }
         console.info('onBundleEnd success');
       },
-      onAllBundlesEnd: (err) => {
+      onAllBundlesEnd: (err: BusinessError) => {
         if (err) {
           console.error('onAllBundlesEnd failed with err: ' + err);
         }
@@ -213,10 +216,9 @@
     return sessionRestore;
   }
   
-  async function restore ()
-  {
+  async restore01 () {
     g_session = createSessionRestore();
-    const backupApps = [
+    const backupApps: string[] = [
       "com.example.hiworld",
     ]
     // 能力文件的获取方式可以根据开发者实际场景进行调整。此处仅为请求示例
@@ -251,21 +253,20 @@
  ```ts
   import fs from '@ohos.file.fs';
   // 创建SessionRestore类的实例用于恢复数据
-  let g_session;
-  async function publishFile(file)
-  {
+  let g_session: backup.SessionRestore;
+  async publishFile(file) {
     await g_session.publishFile({
       bundleName: file.bundleName,
       uri: file.uri
     });
   }
-  function createSessionRestore() {
+  createSessionRestore() {
     let sessionRestore = new backup.SessionRestore({
-      onFileReady: (err, file) => {
+      onFileReady: (err: BusinessError, file: backup.File) => {
       if (err) {
         console.info('onFileReady err: ' + err);
       }
-        let bundlePath;
+        let bundlePath: string;
         if( file.uri == "/data/storage/el2/restore/bundle.hap" )
         {
           // 此处开发者请根据实际场景安装包的存放位置进行调整
@@ -281,19 +282,19 @@
         publishFile(file);
         console.info('onFileReady success');
       },
-      onBundleBegin: (err, bundleName) => {
+      onBundleBegin: (err: BusinessError, bundleName: string) => {
         if (err) {
           console.error('onBundleBegin failed with err: ' + err);
         }
         console.info('onBundleBegin success');
       },
-      onBundleEnd: (err, bundleName) => {
+      onBundleEnd: (err: BusinessError, bundleName: string) => {
         if (err) {
           console.error('onBundleEnd failed with err: ' + err);
         }
         console.info('onBundleEnd success');
       },
-      onAllBundlesEnd: (err) => {
+      onAllBundlesEnd: (err: BusinessError) => {
         if (err) {
           console.error('onAllBundlesEnd failed with err: ' + err);
         }
@@ -306,10 +307,9 @@
     return sessionRestore;
   }
   
-  async function restore ()
-  {
+  async restore02 () {
     g_session = createSessionRestore();
-    const backupApps = [
+    const backupApps: string[] = [
       "com.example.hiworld",
     ]
     let fpath = await globalThis.context.filesDir + '/localCapabilities.json';
diff --git a/zh-cn/application-dev/file-management/app-file-upload-download.md b/zh-cn/application-dev/file-management/app-file-upload-download.md
index a4c8e623bfaa943a9043fcc1b9bbc458dfe42243..bde07c15debc054dcf3b70ea7307d28c9990d40b 100644
--- a/zh-cn/application-dev/file-management/app-file-upload-download.md
+++ b/zh-cn/application-dev/file-management/app-file-upload-download.md
@@ -19,6 +19,7 @@
 import common from '@ohos.app.ability.common';
 import fs from '@ohos.file.fs';
 import request from '@ohos.request';
+import { BusinessError } from '@ohos.base';
 
 // 获取应用文件路径
 let context = getContext(this) as common.UIAbilityContext;
@@ -30,29 +31,29 @@ fs.writeSync(file.fd, 'upload file test');
 fs.closeSync(file);
 
 // 上传任务配置项
-let uploadConfig = {
+let files: Array<request.File> = [
+  { filename: 'test.txt', name: 'test', uri: 'internal://cache/test.txt', type: 'txt' }
+]
+let data: request.RequestData = { name: 'name', value: 'value' };
+let uploadConfig: request.UploadConfig = {
   url: 'https://xxx',
   header: { key1: 'value1', key2: 'value2' },
   method: 'POST',
-  files: [
-    { filename: 'test.txt', name: 'test', uri: 'internal://cache/test.txt', type: 'txt' }
-  ],
-  data: [
-    { name: 'name', value: 'value' }
-  ]
+  files: files,
+  data: [ data ]
 }
 
 // 将本地应用文件上传至网络服务器
 try {
   request.uploadFile(context, uploadConfig)
-    .then((uploadTask) => {
-      uploadTask.on('complete', (taskStates) => {
+    .then((uploadTask: request.UploadTask) => {
+      uploadTask.on('complete', (taskStates: Array<request.TaskState>) => {
         for (let i = 0; i < taskStates.length; i++) {
           console.info(`upload complete taskState: ${JSON.stringify(taskStates[i])}`);
         }
       });
     })
-    .catch((err) => {
+    .catch((err: BusinessError) => {
       console.error(`Invoke uploadFile failed, code is ${err.code}, message is ${err.message}`);
     })
 } catch (err) {
@@ -78,6 +79,7 @@ try {
 import common from '@ohos.app.ability.common';
 import fs from '@ohos.file.fs';
 import request from '@ohos.request';
+import { BusinessError } from '@ohos.base';
 
 // 获取应用文件路径
 let context = getContext(this) as common.UIAbilityContext;
@@ -87,16 +89,17 @@ try {
   request.downloadFile(context, {
     url: 'https://xxxx/xxxx.txt',
     filePath: filesDir + '/xxxx.txt'
-  }).then((downloadTask) => {
+  }).then((downloadTask: request.DownloadTask) => {
     downloadTask.on('complete', () => {
       console.info('download complete');
       let file = fs.openSync(filesDir + '/xxxx.txt', fs.OpenMode.READ_WRITE);
-      let buf = new ArrayBuffer(1024);
-      let readLen = fs.readSync(file.fd, buf);
-      console.info(`The content of file: ${String.fromCharCode.apply(null, new Uint8Array(buf.slice(0, readLen)))}`);
+      let arrayBuffer = new ArrayBuffer(1024);
+      let readLen = fs.readSync(file.fd, arrayBuffer);
+      let buf = buffer.from(arrayBuffer, 0, readLen);
+      console.info(`The content of file: ${buf.toString()}`);
       fs.closeSync(file);
     })
-  }).catch((err) => {
+  }).catch((err: BusinessError) => {
     console.error(`Invoke downloadTask failed, code is ${err.code}, message is ${err.message}`);
   });
 } catch (err) {
diff --git a/zh-cn/application-dev/file-management/app-fs-space-statistics.md b/zh-cn/application-dev/file-management/app-fs-space-statistics.md
index a3d585ff4010b55373980ea22f88a755e036dfb5..210759129a7f4e54f17a32f0016624962279cc9c 100644
--- a/zh-cn/application-dev/file-management/app-fs-space-statistics.md
+++ b/zh-cn/application-dev/file-management/app-fs-space-statistics.md
@@ -28,9 +28,10 @@ API的详细介绍请参见[ohos.file.statvfs](../reference/apis/js-apis-file-st
     
   ```ts
   import statvfs from '@ohos.file.statvfs';
+  import { BusinessError } from '@ohos.base';
   
   let path = "/data";
-  statvfs.getFreeSize(path, (err, number) => {
+  statvfs.getFreeSize(path, (err: BusinessError, number: number) => {
     if (err) {
       console.error(`Invoke getFreeSize failed, code is ${err.code}, message is ${err.message}`);
     } else {
@@ -43,8 +44,9 @@ API的详细介绍请参见[ohos.file.statvfs](../reference/apis/js-apis-file-st
     
   ```ts
   import storageStatistics from "@ohos.file.storageStatistics";
+  import { BusinessError } from '@ohos.base';
   
-  storageStatistics.getCurrentBundleStats((err, bundleStats) => {
+  storageStatistics.getCurrentBundleStats((err: BusinessError, bundleStats: storageStatistics.BundleStats) => {
     if (err) {
       console.error(`Invoke getCurrentBundleStats failed, code is ${err.code}, message is ${err.message}`);
     } else {
diff --git a/zh-cn/application-dev/file-management/dev-user-file-manager.md b/zh-cn/application-dev/file-management/dev-user-file-manager.md
index 8aef15fe41151238f88c7d18781d6e9322f8ae26..4ee4838b0fe7a136887d5ad926dc15cef127c4b9 100644
--- a/zh-cn/application-dev/file-management/dev-user-file-manager.md
+++ b/zh-cn/application-dev/file-management/dev-user-file-manager.md
@@ -22,6 +22,7 @@ OpenHarmony预置了FileManager文件管理器。系统应用开发者也可以
    ```ts
    import fileAccess from '@ohos.file.fileAccess';
    import fileExtensionInfo from '@ohos.file.fileExtensionInfo';
+   import { Filter } from '@ohos.file.fs';
    ```
 
    其中fileAccess提供了文件基础操作的API，fileExtensionInfo提供了应用开发的关键结构体。
@@ -33,7 +34,7 @@ OpenHarmony预置了FileManager文件管理器。系统应用开发者也可以
 
    ```ts
    // 创建连接系统内所有文件管理服务端的helper对象
-   let fileAccessHelperAllServer = null;
+   let fileAccessHelperAllServer: fileAccess.FileAccessHelper;
    createFileAccessHelper() {
      try {    // this.context是EntryAbility传过来的Context
        fileAccessHelperAllServer = fileAccess.createFileAccessHelper(this.context);
@@ -44,23 +45,23 @@ OpenHarmony预置了FileManager文件管理器。系统应用开发者也可以
          console.error("createFileAccessHelper failed, errCode:" + error.code + ", errMessage:" + error.message);
      }
    }
-   async getRoots() {  
-     let rootIterator = null;  
-     let rootInfos = [];  
-     let isDone = false;  
+   async getRoots() {
+     let rootIterator: fileAccess.RootIterator;
+     let rootInfos: fileAccess.RootInfo[] = [];
+     let isDone: boolean = false;
      try {
        rootIterator = await fileAccessHelperAllServer.getRoots();
        if (!rootIterator) {
          console.error("getRoots interface returns an undefined object");
-         return;    
-       }    
+         return;
+       }
        while (!isDone) {
          let result = rootIterator.next();
          console.info("next result = " + JSON.stringify(result));
          isDone = result.done;
          if (!isDone)
-           rootinfos.push(result.value);
-       }  
+           rootInfos.push(result.value);
+       }
      } catch (error) {
        console.error("getRoots failed, errCode:" + error.code + ", errMessage:" + error.message);
      }
@@ -74,10 +75,10 @@ OpenHarmony预置了FileManager文件管理器。系统应用开发者也可以
 
    ```ts
    // 从根目录开始
-   let rootInfo = rootinfos[0];
-   let fileInfos = [];
-   let isDone = false;
-   let filter = {suffix : [".txt", ".jpg", ".xlsx"]}; // 设定过滤条件
+   let rootInfo = rootInfos[0];
+   let fileInfos: fileAccess.FileInfo[] = [];
+   let isDone: boolean = false;
+   let filter: Filter = {suffix : [".txt", ".jpg", ".xlsx"]}; // 设定过滤条件
    try {  
      let fileIterator = rootInfo.listFile();          // 遍历设备rootinfos[0]的根目录，返回迭代器对象
      // let fileIterator = rootInfo.scanFile(filter); // 过滤设备rootinfos[0]满足指定条件的文件信息，返回迭代对象
@@ -98,9 +99,9 @@ OpenHarmony预置了FileManager文件管理器。系统应用开发者也可以
    
    // 从指定的目录开始
    let fileInfoDir = fileInfos[0]; // fileInfoDir 表示某个目录信息
-   let subFileInfos = [];
-   let isDone = false;
-   let filter = {suffix : [".txt", ".jpg", ".xlsx"]}; // 设定过滤条件
+   let subFileInfos: fileAccess.FileInfo[] = [];
+   let isDone: boolean = false;
+   let filter: Filter = {suffix : [".txt", ".jpg", ".xlsx"]}; // 设定过滤条件
    try {
      let fileIterator = fileInfoDir.listFile(); // 遍历特定的目录fileinfo，返回迭代器对象
      // let fileIterator = rootInfo.scanFile(filter); // 过滤特定的目录fileinfo，返回迭代器对象
@@ -113,7 +114,7 @@ OpenHarmony预置了FileManager文件管理器。系统应用开发者也可以
        console.info("next result = " + JSON.stringify(result));
        isDone = result.done;
        if (!isDone)
-         subfileInfos.push(result.value);
+         subFileInfos.push(result.value);
      }
    } catch (error) {
      console.error("listFile failed, errCode:" + error.code + ", errMessage:" + error.message);
@@ -128,9 +129,9 @@ OpenHarmony预置了FileManager文件管理器。系统应用开发者也可以
    // 创建文件
    // 示例代码sourceUri是Download目录的fileinfo中的URI
    // 开发者应根据自己实际获取fileinfo的URI进行开发
-   let sourceUri = "file://docs/storage/Users/currentUser/Download";
-   let displayName = "file1";
-   let fileUri = null;
+   let sourceUri: string = "file://docs/storage/Users/currentUser/Download";
+   let displayName: string = "file1";
+   let fileUri: string;
    try {
      // fileAccessHelper 参考 fileAccess.createFileAccessHelper 示例代码获取
      fileUri = await fileAccessHelper.createFile(sourceUri, displayName);
diff --git a/zh-cn/application-dev/file-management/file-access-across-devices.md b/zh-cn/application-dev/file-management/file-access-across-devices.md
index 2e0443f9b0817c73cd082413e5bf40ea0931505c..b113f565d4c7aa881dccec74c11185d9ae69a551 100644
--- a/zh-cn/application-dev/file-management/file-access-across-devices.md
+++ b/zh-cn/application-dev/file-management/file-access-across-devices.md
@@ -14,11 +14,12 @@
 
    ```ts
    import fs from '@ohos.file.fs';
-   
-   let context = ...; // 获取设备A的UIAbilityContext信息
-   let pathDir = context.distributedFilesDir;
+   import common from '@ohos.app.ability.common';
+
+   let context = getContext(this) as common.UIAbilityContext; // 获取设备A的UIAbilityContext信息
+   let pathDir: string = context.distributedFilesDir;
    // 获取分布式目录的文件路径
-   let filePath = pathDir + '/test.txt';
+   let filePath: string = pathDir + '/test.txt';
    
    try {
      // 在分布式目录下创建文件
@@ -37,23 +38,26 @@
 
    ```ts
    import fs from '@ohos.file.fs';
+   import common from '@ohos.app.ability.common';
+   import buffer from '@ohos.buffer';
    
-   let context = ...; // 获取设备B的UIAbilityContext信息
-   let pathDir = context.distributedFilesDir;
+   let context = getContext(this) as common.UIAbilityContext; // 获取设备B的UIAbilityContext信息
+   let pathDir: string = context.distributedFilesDir;
    // 获取分布式目录的文件路径
-   let filePath = pathDir + '/test.txt';
+   let filePath: string = pathDir + '/test.txt';
    
    try {
      // 打开分布式目录下的文件
      let file = fs.openSync(filePath, fs.OpenMode.READ_WRITE);
      // 定义接收读取数据的缓存
-     let buffer = new ArrayBuffer(4096);
+     let arrayBuffer = new ArrayBuffer(4096);
      // 读取文件的内容，返回值是读取到的字节个数
-     let num = fs.readSync(file.fd, buffer, {
+     let num = fs.readSync(file.fd, arrayBuffer, {
        offset: 0
      });
      // 打印读取到的文件数据
-     console.info('read result: ' + String.fromCharCode.apply(null, new Uint8Array(buffer.slice(0, num))));
+     let buf = buffer.from(arrayBuffer, 0, num);
+     console.info('read result: ' + buf.toString());
    } catch (err) {
      console.error(`Failed to openSync / readSync. Code: ${err.code}, message: ${err.message}`);
    }
diff --git a/zh-cn/application-dev/file-management/manage-external-storage.md b/zh-cn/application-dev/file-management/manage-external-storage.md
index 3605bb615958975d445536bc24ff97399575171c..8ed79dbc3678d448b5614aea9d0280fd42f9c241 100644
--- a/zh-cn/application-dev/file-management/manage-external-storage.md
+++ b/zh-cn/application-dev/file-management/manage-external-storage.md
@@ -55,8 +55,9 @@
    ```ts
    import CommonEvent from '@ohos.commonEventManager';
    import volumeManager from '@ohos.file.volumeManager';
-   
-   const subscribeInfo = {
+   import { BusinessError } from '@ohos.base';
+
+   const subscribeInfo: CommonEvent.CommonEventSubscribeInfo = {
        events: [
            "usual.event.data.VOLUME_REMOVED",
            "usual.event.data.VOLUME_UNMOUNTED",
@@ -71,11 +72,11 @@
 3. 收到广播通知后获取卷设备信息。
 
    ```ts
-   CommonEvent.subscribe(subscriber, function (err, data) {
+   CommonEvent.subscribe(subscriber, (err: BusinessError, data: CommonEvent.CommonEventData) => {
      if (data.event === 'usual.event.data.VOLUME_MOUNTED') {
        // 开发者可以通过广播传递的卷设备信息来管理卷设备
-       let volId = data.parameters.id;
-       volumeManager.getVolumeById(volId, function(error, vol) {
+       let volId: string = data.parameters.id;
+       volumeManager.getVolumeById(volId, (error: BusinessError, vol: volumeManager.Volume) => {
          if (error) {
            console.error('volumeManager getVolumeById failed');
          } else {
diff --git a/zh-cn/application-dev/file-management/save-user-file.md b/zh-cn/application-dev/file-management/save-user-file.md
index ff52752af54a91a429b72449d96abacd912a472c..15121f354a20290e5f08e1ac72ba7bfae1ff0c56 100644
--- a/zh-cn/application-dev/file-management/save-user-file.md
+++ b/zh-cn/application-dev/file-management/save-user-file.md
@@ -18,33 +18,36 @@ save接口会将文件保存在文件管理器，而不是图库。
    import fs from '@ohos.file.fs';
    import photoAccessHelper from '@ohos.file.photoAccessHelper';
    import dataSharePredicates from '@ohos.data.dataSharePredicates';
+   import common from '@ohos.app.ability.common';
+   import image from '@ohos.multimedia.image';
+   import { BusinessError } from '@ohos.base';
    ```
 
 2. 获取设备里第一张图片的缩略图。注意：在执行这一步之前，要先确保设备里至少有一张图片。
 
    ```ts
-   const context = getContext(this);
-   let photoAccessHelper = photoAccessHelper.getPhotoAccessHelper(context);
+   let context = getContext(this) as common.UIAbilityContext;
+   let phAccessHelper = photoAccessHelper.getPhotoAccessHelper(context);
 
-   let pixelmapArrayBuffer;
+   let pixelmapArrayBuffer: ArrayBuffer;
    async getPixelmap() {
       try {
          let predicates = new dataSharePredicates.DataSharePredicates();
-         let fetchOption = {
+         let fetchOption: photoAccessHelper.FetchOptions = {
             fetchColumns: [],
             predicates: predicates
          };
-         let fetchResult = await photoAccessHelper.getAssets(fetchOption);
+         let fetchResult = await phAccessHelper.getAssets(fetchOption);
          console.info('[picker] getThumbnail fetchResult: ' + fetchResult);
          const asset = await fetchResult.getFirstObject();
          console.info('[picker] getThumbnail asset displayName = ', asset.displayName);
-         asset.getThumbnail().then((pixelMap) => {
+         asset.getThumbnail().then((pixelMap: image.PixelMap) => {
             let pixelBytesNumber = pixelMap.getPixelBytesNumber();
             const readBuffer = new ArrayBuffer(pixelBytesNumber);
             pixelMap.readPixelsToBuffer(readBuffer).then(() => {
                pixelmapArrayBuffer = readBuffer;
             })
-         }).catch((err) => {
+         }).catch((err: BusinessError) => {
             console.error('[picker] getThumbnail failed with error: ' + err);
          });
       } catch (error) {
@@ -58,7 +61,7 @@ save接口会将文件保存在文件管理器，而不是图库。
    save返回的uri权限是读写权限，可以根据结果集里面的uri进行文件读写等操作。注意不能在picker的回调里直接使用此uri进行打开文件操作，需要定义一个全局变量保存uri，使用类似一个按钮去触发打开文件。
 
    ```ts  
-   let uris = null;
+   let uris: string;
    async photoViewPickerSave() {
       try {
          const photoSaveOptions = new picker.PhotoSaveOptions(); // 创建文件管理器保存选项实例
@@ -85,7 +88,7 @@ save接口会将文件保存在文件管理器，而不是图库。
    然后，通过fd使用[fs.write](../reference/apis/js-apis-file-fs.md#fswrite)接口对这个文件进行编辑修改，编辑修改完成后关闭fd。
 
    ```ts
-   async writeOnly(uri) {
+   async writeOnly(uri: string) {
       try {
          let file = fs.openSync(uri, fs.OpenMode.WRITE_ONLY);
          let writeLen = await fs.write(file.fd, pixelmapArrayBuffer);
@@ -104,6 +107,7 @@ save接口会将文件保存在文件管理器，而不是图库。
    ```ts
    import picker from '@ohos.file.picker';
    import fs from '@ohos.file.fs';
+   import { BusinessError } from '@ohos.base';
    ```
 
 2. 创建文档保存选项实例。
@@ -119,12 +123,12 @@ save接口会将文件保存在文件管理器，而不是图库。
    </br>save返回的uri权限是读写权限，可以根据结果集中uri进行文件读写等操作。注意不能在picker的回调里直接使用此uri进行打开文件操作，需要定义一个全局变量保存uri，使用类似一个按钮去触发打开文件。
 
    ```ts
-   let uris = null;
+   let uris: Array<string>;
    const documentViewPicker = new picker.DocumentViewPicker(); // 创建文件选择器实例
-   documentViewPicker.save(documentSaveOptions).then((documentSaveResult) => {
+   documentViewPicker.save(documentSaveOptions).then((documentSaveResult: Array<string>) => {
      uris = documentSaveResult;
      console.info('documentViewPicker.save to file succeed and uris are:' + uris);
-   }).catch((err) => {
+   }).catch((err: BusinessError) => {
      console.error(`Invoke documentViewPicker.save failed, code is ${err.code}, message is ${err.message}`);
    })
    ```
@@ -151,6 +155,7 @@ save接口会将文件保存在文件管理器，而不是图库。
    ```ts
    import picker from '@ohos.file.picker';
    import fs from '@ohos.file.fs';
+   import { BusinessError } from '@ohos.base';
    ```
 
 2. 创建音频保存选项实例。
@@ -165,12 +170,12 @@ save接口会将文件保存在文件管理器，而不是图库。
    </br>save返回的uri权限是读写权限，可以根据结果集中uri进行文件读写等操作。注意不能在picker的回调里直接使用此uri进行打开文件操作，需要定义一个全局变量保存uri，使用类似一个按钮去触发打开文件。
    
    ```ts
-   let uri = null;
+   let uri: string;
    const audioViewPicker = new picker.AudioViewPicker();
-   audioViewPicker.save(audioSaveOptions).then((audioSelectResult) => {
+   audioViewPicker.save(audioSaveOptions).then((audioSelectResult: Array<string>) => {
      uri = audioSelectResult[0];
      console.info('audioViewPicker.save to file succeed and uri is:' + uri);
-   }).catch((err) => {
+   }).catch((err: BusinessError) => {
      console.error(`Invoke audioViewPicker.save failed, code is ${err.code}, message is ${err.message}`);
    })
    ```
diff --git a/zh-cn/application-dev/file-management/select-user-file.md b/zh-cn/application-dev/file-management/select-user-file.md
index 8d8689edb49c72746e21c68b04d1970a244f46a2..1bd67b591f9209176452b2ef484d517f90a49acd 100644
--- a/zh-cn/application-dev/file-management/select-user-file.md
+++ b/zh-cn/application-dev/file-management/select-user-file.md
@@ -17,6 +17,7 @@
    ```ts
    import picker from '@ohos.file.picker';
    import fs from '@ohos.file.fs';
+   import { BusinessError } from '@ohos.base';
    ```
 
 2. 创建图库选择选项实例。
@@ -38,12 +39,12 @@
    </br>select返回的uri权限是只读权限，可以根据结果集中uri进行读取文件数据操作。注意不能在picker的回调里直接使用此uri进行打开文件操作，需要定义一个全局变量保存uri，使用类似一个按钮去触发打开文件。
 
    ```ts
-   let uris = null;
+   let uris: Array<string>;
    const photoViewPicker = new picker.PhotoViewPicker();
-   photoViewPicker.select(photoSelectOptions).then((photoSelectResult) => {
+   photoViewPicker.select(photoSelectOptions).then((photoSelectResult: picker.PhotoSelectResult) => {
      uris = photoSelectResult.photoUris;
      console.info('photoViewPicker.select to file succeed and uris are:' + uris);
-   }).catch((err) => {
+   }).catch((err: BusinessError) => {
      console.error(`Invoke photoViewPicker.select failed, code is ${err.code}, message is ${err.message}`);
    })
    ```
@@ -71,6 +72,8 @@
    ```ts
    import picker from '@ohos.file.picker';
    import fs from '@ohos.file.fs';
+   import Want from '@ohos.app.ability.Want';
+   import { BusinessError } from '@ohos.base';
    ```
 
 2. 创建文档选择选项实例。
@@ -89,12 +92,12 @@
    </br>例如通过[文件管理接口](../reference/apis/js-apis-file-fs.md)根据uri获取部分文件属性信息，比如文件大小、访问时间、修改时间等。如有获取文件名称需求，请暂时使用[startAbilityForResult](../../application-dev/application-models/uiability-intra-device-interaction.md)获取。
 
    ```ts
-   let uris = null;
+   let uris: Array<string>;
    const documentViewPicker = new picker.DocumentViewPicker(); // 创建文件选择器实例
-   documentViewPicker.select(documentSelectOptions).then((documentSelectResult) => {
+   documentViewPicker.select(documentSelectOptions).then((documentSelectResult: Array<string>) => {
      uris = documentSelectResult;
      console.info('documentViewPicker.select to file succeed and uris are:' + uris);
-   }).catch((err) => {
+   }).catch((err: BusinessError) => {
      console.error(`Invoke documentViewPicker.select failed, code is ${err.code}, message is ${err.message}`);
    })
    ```
@@ -104,7 +107,7 @@
    > 目前DocumentSelectOptions功能不完整, 如需获取文件名称，请使用startAbilityForResult接口。
 
    ```ts
-   let config = {
+   let config: Want = {
      action: 'ohos.want.action.OPEN_FILE',
      parameters: {
        startMode: 'choose',
@@ -149,6 +152,7 @@
    ```ts
    import picker from '@ohos.file.picker';
    import fs from '@ohos.file.fs';
+   import { BusinessError } from '@ohos.base';
    ```
 
 2. 创建音频选择选项实例。
@@ -168,12 +172,12 @@
    > 目前AudioSelectOptions不支持参数配置，默认可以选择所有类型的用户文件。
 
    ```ts
-   let uri = null;
+   let uri: string;
    const audioViewPicker = new picker.AudioViewPicker();
-   audioViewPicker.select(audioSelectOptions).then(audioSelectResult => {
+   audioViewPicker.select(audioSelectOptions).then((audioSelectResult: Array<string>) => {
      uri = audioSelectResult[0];
      console.info('audioViewPicker.select to file succeed and uri is:' + uri);
-   }).catch((err) => {
+   }).catch((err: BusinessError) => {
      console.error(`Invoke audioViewPicker.select failed, code is ${err.code}, message is ${err.message}`);
    })
    ```
diff --git a/zh-cn/application-dev/file-management/set-security-label.md b/zh-cn/application-dev/file-management/set-security-label.md
index a936e10442733389fc2c764b0a947aea57b496c7..97a5a07a9435a407004452c4511f6a9a226137f4 100644
--- a/zh-cn/application-dev/file-management/set-security-label.md
+++ b/zh-cn/application-dev/file-management/set-security-label.md
@@ -26,16 +26,18 @@ API详细介绍请参见[ohos.file.securityLabel](../reference/apis/js-apis-file
   
 ```ts
 import securityLabel from '@ohos.file.securityLabel';
+import { BusinessError } from '@ohos.base';
+import common from '@ohos.app.ability.common';
 
 // 获取需要设备数据等级的文件沙箱路径
-let context = ...; // 获取UIAbilityContext信息
+let context = getContext(this) as common.UIAbilityContext; // 获取UIAbilityContext信息
 let pathDir = context.filesDir;
 let filePath = pathDir + '/test.txt';
 
 // 设置文件的数据等级为s0
 securityLabel.setSecurityLabel(filePath, 's0').then(() => {
   console.info('Succeeded in setSecurityLabeling.');
-}).catch((err) => {
+}).catch((err: BusinessError) => {
   console.error(`Failed to setSecurityLabel. Code: ${err.code}, message: ${err.message}`);
 });
 ```
diff --git a/zh-cn/application-dev/file-management/share-app-file.md b/zh-cn/application-dev/file-management/share-app-file.md
index 2d93e836d3387cbcbe2f1f18ce7741ad4bdc4aab..9186dcad5112cc97bafec468a27a27d064a0a796 100644
--- a/zh-cn/application-dev/file-management/share-app-file.md
+++ b/zh-cn/application-dev/file-management/share-app-file.md
@@ -54,6 +54,8 @@
    import window from '@ohos.window';
    import wantConstant from '@ohos.app.ability.wantConstant';
    import UIAbility from '@ohos.app.ability.UIAbility';
+   import Want from '@ohos.app.ability.Want';
+   import { BusinessError } from '@ohos.base';
    
    export default class EntryAbility extends UIAbility {
      onWindowStageCreate(windowStage: window.WindowStage) {
@@ -61,7 +63,7 @@
        let filePath = this.context.filesDir + '/test.txt';
        // 将沙箱路径转换为uri
        let uri = fileuri.getUriFromPath(filePath);
-       let want = {
+       let want: Want  = {
          // 配置被分享文件的读写权限，例如对被分享应用进行读写授权
          flags: wantConstant.Flags.FLAG_AUTH_WRITE_URI_PERMISSION | wantConstant.Flags.FLAG_AUTH_READ_URI_PERMISSION,
          // 配置分享应用的隐式拉起规则
@@ -73,7 +75,7 @@
          .then(() => {
            console.info('Invoke getCurrentBundleStats succeeded.');
          })
-         .catch((err) => {
+         .catch((err: BusinessError) => {
            console.error(`Invoke startAbility failed, code is ${err.code}, message is ${err.message}`);
          });
      }
@@ -120,10 +122,11 @@
 ```ts
 // xxx.ets
 import fs from '@ohos.file.fs';
+import Want from '@ohos.app.ability.Want';
 
 function getShareFile() {
   try {
-    let want = ...; // 获取分享方传递过来的want信息
+    let want: Want = ...; // 获取分享方传递过来的want信息
 
     // 从want信息中获取uri字段
     let uri = want.uri;
diff --git a/zh-cn/application-dev/reference/apis/js-apis-file-picker.md b/zh-cn/application-dev/reference/apis/js-apis-file-picker.md
index 3e629cc7644d65ab86b3760e232a52bef271688e..4c48afe9b0c47196d45d0a96c2e0951bd89c08a4 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-file-picker.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-file-picker.md
@@ -8,8 +8,9 @@
 
 ## 导入模块
 
-```js
+```ts
 import picker from '@ohos.file.picker';
+import { BusinessError } from '@ohos.base';
 ```
 
 ## PhotoViewPicker
@@ -47,15 +48,15 @@ select(option?: PhotoSelectOptions) : Promise&lt;PhotoSelectResult&gt;
 **示例：**
 
 ```ts
-async function example() {
+async example01() {
   try {  
     let PhotoSelectOptions = new picker.PhotoSelectOptions();
     PhotoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE;
     PhotoSelectOptions.maxSelectNumber = 5;
     let photoPicker = new picker.PhotoViewPicker();
-    photoPicker.select(PhotoSelectOptions).then((PhotoSelectResult) => {
+    photoPicker.select(PhotoSelectOptions).then((PhotoSelectResult: picker.PhotoSelectResult) => {
       console.info('PhotoViewPicker.select successfully, PhotoSelectResult uri: ' + JSON.stringify(PhotoSelectResult));
-    }).catch((err) => {
+    }).catch((err: BusinessError) => {
       console.error('PhotoViewPicker.select failed with err: ' + err);
     });
   } catch (err) {
@@ -82,13 +83,13 @@ select(option: PhotoSelectOptions, callback: AsyncCallback&lt;PhotoSelectResult&
 **示例：**
 
 ```ts
-async function example() {
-  try {   
+async example02() {
+  try {
     let PhotoSelectOptions = new picker.PhotoSelectOptions();
     PhotoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE;
     PhotoSelectOptions.maxSelectNumber = 5;
     let photoPicker = new picker.PhotoViewPicker();
-    photoPicker.select(PhotoSelectOptions, (err, PhotoSelectResult) => {
+    photoPicker.select(PhotoSelectOptions, (err: BusinessError, PhotoSelectResult: picker.PhotoSelectResult) => {
       if (err) {
         console.error('PhotoViewPicker.select failed with err: ' + err);
         return;
@@ -118,10 +119,10 @@ select(callback: AsyncCallback&lt;PhotoSelectResult&gt;) : void
 **示例：**
 
 ```ts
-async function example() {
-  try {   
+async example03() {
+  try {
     let photoPicker = new picker.PhotoViewPicker();
-    photoPicker.select((err, PhotoSelectResult) => {
+    photoPicker.select((err: BusinessError, PhotoSelectResult: picker.PhotoSelectResult) => {
       if (err) {
         console.error('PhotoViewPicker.select failed with err: ' + err);
         return;
@@ -157,14 +158,14 @@ save(option?: PhotoSaveOptions) : Promise&lt;Array&lt;string&gt;&gt;
 **示例：**
 
 ```ts
-async function example() {
-  try {   
+async example04() {
+  try {
     let PhotoSaveOptions = new picker.PhotoSaveOptions();
     PhotoSaveOptions.newFileNames = ['PhotoViewPicker01.jpg', 'PhotoViewPicker01.mp4'];
     let photoPicker = new picker.PhotoViewPicker();
-    photoPicker.save(PhotoSaveOptions).then((PhotoSaveResult) => {
+    photoPicker.save(PhotoSaveOptions).then((PhotoSaveResult: Array<string>) => {
       console.info('PhotoViewPicker.save successfully, PhotoSaveResult uri: ' + JSON.stringify(PhotoSaveResult));
-    }).catch((err) => {
+    }).catch((err: BusinessError) => {
       console.error('PhotoViewPicker.save failed with err: ' + err);
     });
   } catch (err) {
@@ -191,12 +192,12 @@ save(option: PhotoSaveOptions, callback: AsyncCallback&lt;Array&lt;string&gt;&gt
 **示例：**
 
 ```ts
-async function example() {
+async example05() {
   try {
     let PhotoSaveOptions = new picker.PhotoSaveOptions();
     PhotoSaveOptions.newFileNames = ['PhotoViewPicker02.jpg','PhotoViewPicker02.mp4'];
     let photoPicker = new picker.PhotoViewPicker();
-    photoPicker.save(PhotoSaveOptions, (err, PhotoSaveResult) => {
+    photoPicker.save(PhotoSaveOptions, (err: BusinessError, PhotoSaveResult: Array<string>) => {
       if (err) {
         console.error('PhotoViewPicker.save failed with err: ' + err);
         return;
@@ -226,10 +227,10 @@ save(callback: AsyncCallback&lt;Array&lt;string&gt;&gt;) : void
 **示例：**
 
 ```ts
-async function example() {
+async example06() {
   try {
     let photoPicker = new picker.PhotoViewPicker();
-    photoPicker.save((err, PhotoSaveResult) => {
+    photoPicker.save((err: BusinessError, PhotoSaveResult: Array<string>) => {
       if (err) {
         console.error('PhotoViewPicker.save failed with err: ' + err);
         return;
@@ -277,13 +278,13 @@ select(option?: DocumentSelectOptions) : Promise&lt;Array&lt;string&gt;&gt;
 **示例：**
 
 ```ts
-async function example() {
+async example07() {
   try {
     let DocumentSelectOptions = new picker.DocumentSelectOptions();
     let documentPicker = new picker.DocumentViewPicker();
-    documentPicker.select(DocumentSelectOptions).then((DocumentSelectResult) => {
+    documentPicker.select(DocumentSelectOptions).then((DocumentSelectResult: Array<string>) => {
       console.info('DocumentViewPicker.select successfully, DocumentSelectResult uri: ' + JSON.stringify(DocumentSelectResult));
-    }).catch((err) => {
+    }).catch((err: BusinessError) => {
       console.error('DocumentViewPicker.select failed with err: ' + err);
     });
   } catch (err) {
@@ -310,11 +311,11 @@ select(option: DocumentSelectOptions, callback: AsyncCallback&lt;Array&lt;string
 **示例：**
 
 ```ts
-async function example() {
+async example08() {
   try {
     let DocumentSelectOptions = new picker.DocumentSelectOptions();
     let documentPicker = new picker.DocumentViewPicker();
-    documentPicker.select(DocumentSelectOptions, (err, DocumentSelectResult) => {
+    documentPicker.select(DocumentSelectOptions, (err: BusinessError, DocumentSelectResult: Array<string>) => {
       if (err) {
         console.error('DocumentViewPicker.select failed with err: ' + err);
         return;
@@ -344,10 +345,10 @@ select(callback: AsyncCallback&lt;Array&lt;string&gt;&gt;) : void
 **示例：**
 
 ```ts
-async function example() {
+async example09() {
   try {
     let documentPicker = new picker.DocumentViewPicker();
-    documentPicker.select((err, DocumentSelectResult) => {
+    documentPicker.select((err: BusinessError, DocumentSelectResult: Array<string>) => {
       if (err) {
         console.error('DocumentViewPicker.select failed with err: ' + err);
         return;
@@ -384,14 +385,14 @@ save(option?: DocumentSaveOptions) : Promise&lt;Array&lt;string&gt;&gt;
 **示例：**
 
 ```ts
-async function example() {
+async example10() {
   try {
     let DocumentSaveOptions = new picker.DocumentSaveOptions();
     DocumentSaveOptions.newFileNames = ['DocumentViewPicker01.txt'];
     let documentPicker = new picker.DocumentViewPicker();
-    documentPicker.save(DocumentSaveOptions).then((DocumentSaveResult) => {
+    documentPicker.save(DocumentSaveOptions).then((DocumentSaveResult: Array<string>) => {
       console.info('DocumentViewPicker.save successfully, DocumentSaveResult uri: ' + JSON.stringify(DocumentSaveResult));
-    }).catch((err) => {
+    }).catch((err: BusinessError) => {
       console.error('DocumentViewPicker.save failed with err: ' + err);
     });
   } catch (err) {
@@ -418,12 +419,12 @@ save(option: DocumentSaveOptions, callback: AsyncCallback&lt;Array&lt;string&gt;
 **示例：**
 
 ```ts
-async function example() {
+async example11() {
   try {
     let DocumentSaveOptions = new picker.DocumentSaveOptions();
     DocumentSaveOptions.newFileNames = ['DocumentViewPicker02.txt'];
     let documentPicker = new picker.DocumentViewPicker();
-    documentPicker.save(DocumentSaveOptions, (err, DocumentSaveResult) => {
+    documentPicker.save(DocumentSaveOptions, (err: BusinessError, DocumentSaveResult: Array<string>) => {
       if (err) {
         console.error('DocumentViewPicker.save failed with err: ' + err);
         return;
@@ -453,10 +454,10 @@ save(callback: AsyncCallback&lt;Array&lt;string&gt;&gt;) : void
 **示例：**
 
 ```ts
-async function example() {
+async example12() {
   try {
     let documentPicker = new picker.DocumentViewPicker();
-    documentPicker.save((err, DocumentSaveResult) => {
+    documentPicker.save((err: BusinessError, DocumentSaveResult: Array<string>) => {
       if (err) {
         console.error('DocumentViewPicker.save failed with err: ' + err);
         return;
@@ -504,13 +505,13 @@ select(option?: AudioSelectOptions) : Promise&lt;Array&lt;string&gt;&gt;
 **示例：**
 
 ```ts
-async function example() {
+async example13() {
   try {
     let AudioSelectOptions = new picker.AudioSelectOptions();
     let audioPicker = new picker.AudioViewPicker();
-    audioPicker.select(AudioSelectOptions).then((AudioSelectResult) => {
+    audioPicker.select(AudioSelectOptions).then((AudioSelectResult: Array<string>) => {
       console.info('AudioViewPicker.select successfully, AudioSelectResult uri: ' + JSON.stringify(AudioSelectResult));
-    }).catch((err) => {
+    }).catch((err: BusinessError) => {
       console.error('AudioViewPicker.select failed with err: ' + err);
     });
   } catch (err) {
@@ -537,11 +538,11 @@ select(option: AudioSelectOptions, callback: AsyncCallback&lt;Array&lt;string&gt
 **示例：**
 
 ```ts
-async function example() {
+async example14() {
   try {
     let AudioSelectOptions = new picker.AudioSelectOptions();
     let audioPicker = new picker.AudioViewPicker();
-    audioPicker.select(AudioSelectOptions, (err, AudioSelectResult) => {
+    audioPicker.select(AudioSelectOptions, (err: BusinessError, AudioSelectResult: Array<string>) => {
       if (err) {
         console.error('AudioViewPicker.select failed with err: ' + err);
         return;
@@ -571,10 +572,10 @@ select(callback: AsyncCallback&lt;Array&lt;string&gt;&gt;) : void
 **示例：**
 
 ```ts
-async function example() {
+async example15() {
   try {
     let audioPicker = new picker.AudioViewPicker();
-    audioPicker.select((err, AudioSelectResult) => {
+    audioPicker.select((err: BusinessError, AudioSelectResult: Array<string>) => {
       if (err) {
         console.error('AudioViewPicker.select failed with err: ' + err);
         return;
@@ -610,14 +611,14 @@ save(option?: AudioSaveOptions) : Promise&lt;Array&lt;string&gt;&gt;
 **示例：**
 
 ```ts
-async function example() {
+async example16() {
   try {
     let AudioSaveOptions = new picker.AudioSaveOptions();
     AudioSaveOptions.newFileNames = ['AudioViewPicker01.mp3'];
     let audioPicker = new picker.AudioViewPicker();
-    audioPicker.save(AudioSaveOptions).then((AudioSaveResult) => {
+    audioPicker.save(AudioSaveOptions).then((AudioSaveResult: Array<string>) => {
       console.info('AudioViewPicker.save successfully, AudioSaveResult uri: ' + JSON.stringify(AudioSaveResult))
-    }).catch((err) => {
+    }).catch((err: BusinessError) => {
       console.error('AudioViewPicker.save failed with err: ' + err);
     });
   } catch (err) {
@@ -644,12 +645,12 @@ save(option: AudioSaveOptions, callback: AsyncCallback&lt;Array&lt;string&gt;&gt
 **示例：**
 
 ```ts
-async function example() {
+async example17() {
   try {
     let AudioSaveOptions = new picker.AudioSaveOptions();
     AudioSaveOptions.newFileNames = ['AudioViewPicker02.mp3'];
     let audioPicker = new picker.AudioViewPicker();
-    audioPicker.save(AudioSaveOptions, (err, AudioSaveResult) => {
+    audioPicker.save(AudioSaveOptions, (err: BusinessError, AudioSaveResult: Array<string>) => {
       if (err) {
         console.error('AudioViewPicker.save failed with err: ' + err);
         return;
@@ -679,10 +680,10 @@ save(callback: AsyncCallback&lt;Array&lt;string&gt;&gt;) : void
 **示例：**
 
 ```ts
-async function example() {
+async example18() {
   try {
     let audioPicker = new picker.AudioViewPicker();
-    audioPicker.save((err, AudioSaveResult) => {
+    audioPicker.save((err: BusinessError, AudioSaveResult: Array<string>) => {
       if (err) {
         console.error('AudioViewPicker.save failed with err: ' + err);
         return;