diff --git a/PreHttpRequestUseFiles/README.md b/PreHttpRequestUseFiles/README.md
index 53004a129808189e51b667bc751296976596cf0c..1189227ba7931ea8fc46a209712777b9d431a097 100644
--- a/PreHttpRequestUseFiles/README.md
+++ b/PreHttpRequestUseFiles/README.md
@@ -22,6 +22,8 @@
 ├──entry/src/main/ets
 │  ├──entryability
 │  │  └──EntryAbility.ets                   // 程序入口类
+│  ├──entrybackupability
+│  │  └──EntryBackupAbility.ets             // 应用数据备份恢复类
 │  ├──pages
 │  │  ├──MainPage.ets                       // 视图层-父页面
 │  │  └──PageOne.ets                        // 视图层-子页面
diff --git a/PreHttpRequestUseFiles/entry/src/main/ets/pages/MainPage.ets b/PreHttpRequestUseFiles/entry/src/main/ets/pages/MainPage.ets
index a27e8f7a75315d3b36c9a1fa22b1bee6d2f2e618..842afe2d8331a27ba5a0cfbe815cc16e7e1c3c0f 100644
--- a/PreHttpRequestUseFiles/entry/src/main/ets/pages/MainPage.ets
+++ b/PreHttpRequestUseFiles/entry/src/main/ets/pages/MainPage.ets
@@ -21,12 +21,12 @@ import Logger from '../utils/Logger';
 
 // Obtain the path of the application file
 const uiContext: UIContext | undefined = AppStorage.get('uiContext');
-let context = uiContext?.getHostContext() as common.UIAbilityContext;
-let filesDir = context.filesDir;
-let fileUrl = filesDir + '/xxx.png'; // The image's network address suffix needs to be replaced by the real url.
+let context: common.UIAbilityContext = uiContext?.getHostContext() as common.UIAbilityContext;
+let filesDir: string = context.filesDir;
+let fileUrl: string = filesDir + '/xxx.png'; // The image's network address suffix needs to be replaced by the real url.
 let para: Record<string, PixelMap | undefined> = { 'imageData': undefined };
 let localStorage: LocalStorage = new LocalStorage(para);
-const TAG = '[GetPixMapFunc]';
+const TAG: string = '[GetPixMapFunc]';
 
 @Entry(localStorage)
 @Component
@@ -36,7 +36,7 @@ struct MainPage {
 
   getPixMap() { // Read files from the application sandbox
     try {
-      let file = fs.openSync(fileUrl, fs.OpenMode.READ_WRITE); // Open the file in a synchronous manner
+      let file: fs.File = fs.openSync(fileUrl, fs.OpenMode.READ_WRITE); // Open the file in a synchronous manner
       const imageSource: image.ImageSource = image.createImageSource(file.fd);
       const options: image.InitializationOptions = {
         'alphaType': 0, // transparency
diff --git a/PreHttpRequestUseFiles/entry/src/main/ets/utils/NetRequest.ets b/PreHttpRequestUseFiles/entry/src/main/ets/utils/NetRequest.ets
index 564eb341a91fd0bddbe312ecdb1f3940ecc47ebb..61f265455cfe4dab751467c59f939dbe419b9d9a 100644
--- a/PreHttpRequestUseFiles/entry/src/main/ets/utils/NetRequest.ets
+++ b/PreHttpRequestUseFiles/entry/src/main/ets/utils/NetRequest.ets
@@ -20,9 +20,9 @@ import { common } from '@kit.AbilityKit';
 
 // Obtain the path of the application file
 const uiContext: UIContext | undefined = AppStorage.get('uiContext');
-let context = uiContext?.getHostContext() as common.UIAbilityContext;
-let filesDir = context.filesDir;
-let fileUrl = filesDir + '/xxx.png'; // The image's network address suffix needs to be replaced by the real url.
+let context: common.UIAbilityContext = uiContext?.getHostContext() as common.UIAbilityContext;
+let filesDir: string = context.filesDir;
+let fileUrl: string = filesDir + '/xxx.png'; // The image's network address suffix needs to be replaced by the real url.
 
 export async function httpRequest() {
   fs.access(fileUrl, fs.AccessModeType.READ).then((res) => { // Check whether files exist
@@ -50,7 +50,7 @@ export async function httpRequest() {
 
 // Write to the sandbox
 async function readWriteFileWithStream(imageData: ArrayBuffer): Promise<void> {
-  let outputStream = fs.createStreamSync(fileUrl, 'w+');
+  let outputStream: fs.Stream = fs.createStreamSync(fileUrl, 'w+');
   await outputStream.write(imageData);
   outputStream.closeSync();
 }
diff --git a/PreHttpRequestUseFiles/entry/src/main/resources/base/element/string.json b/PreHttpRequestUseFiles/entry/src/main/resources/base/element/string.json
index 32ea56af0ac0e3390dadd8496a9aaee7390a4aaa..9a4e74633ce81531696f4759fc297b2a1a990083 100644
--- a/PreHttpRequestUseFiles/entry/src/main/resources/base/element/string.json
+++ b/PreHttpRequestUseFiles/entry/src/main/resources/base/element/string.json
@@ -10,7 +10,7 @@
     },
     {
       "name": "EntryAbility_label",
-      "value": "label"
+      "value": "PreHttpRequestUseFiles"
     },
     {
       "name": "internet_reason",
diff --git a/PreHttpRequestUseFiles/entry/src/main/resources/en_US/element/string.json b/PreHttpRequestUseFiles/entry/src/main/resources/en_US/element/string.json
index 32ea56af0ac0e3390dadd8496a9aaee7390a4aaa..9a4e74633ce81531696f4759fc297b2a1a990083 100644
--- a/PreHttpRequestUseFiles/entry/src/main/resources/en_US/element/string.json
+++ b/PreHttpRequestUseFiles/entry/src/main/resources/en_US/element/string.json
@@ -10,7 +10,7 @@
     },
     {
       "name": "EntryAbility_label",
-      "value": "label"
+      "value": "PreHttpRequestUseFiles"
     },
     {
       "name": "internet_reason",
diff --git a/PreHttpRequestUseFiles/entry/src/main/resources/zh_CN/element/string.json b/PreHttpRequestUseFiles/entry/src/main/resources/zh_CN/element/string.json
index 2cfac88316a0993b7b743aadbf5a58811ef9bc69..aac03c8c216535da2c05b7aa1cc5a2af69a839c2 100644
--- a/PreHttpRequestUseFiles/entry/src/main/resources/zh_CN/element/string.json
+++ b/PreHttpRequestUseFiles/entry/src/main/resources/zh_CN/element/string.json
@@ -10,7 +10,7 @@
     },
     {
       "name": "EntryAbility_label",
-      "value": "label"
+      "value": "PreHttpRequestUseFiles"
     },
     {
       "name": "internet_reason",