diff --git a/README.md b/README.md
index d3ee02056bf0041440c7cd5107edbef65a373503..1e31784494466e57056f954db882c3c496d82030 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,14 @@
 # 基于后台任务实现应用流畅体验
 
 ### 简介
-基于后台任务开发服务实现应用后台保活，本示例分为短时与长时任务模式。短时任务模式使用onApplicationForeground()/onApplicationBackground()监听前后台切换，转后台时申请短时任务。长时模式以位置服务为例，申请长时任务并订阅位置变化，应用切后台时系统仍能自动获取位置信息。
+本示例基于后台任务开发服务实现应用后台保活，短时模式监听前后台切换，转后台即申请短时任务；长时模式以位置服务为例，申请长时任务并订阅位置变化，确保应用后台也能自动获取位置信息。
+
 ### 效果预览
 |                     **主页面**                     |                     **后台申请短时任务页面**                     |                 **后台申请长时任务页面**                  |
 |:-----------------------------------------------:|:------------------------------------------------------:|:-----------------------------------------------:|
 | ![](screenshots/device/Home.png) |    ![](screenshots/device/ShortTermTaskPage.png)     | ![](screenshots/device/LongTermTaskPage.png) |
-### 工程目录 
+
+### 工程目录
 ```
 ├──entry/src/main/ets                           // 代码区
 │  ├──entryability
@@ -37,9 +39,8 @@
 7. 点击“开启定位服务”，日志控制台会周期性地打印出当前的位置信息数据；
 8. 在当前页面，把应用最小化之后，日志控制台会周期性地打印出当前的位置信息数据；
 9. 注：由于长时模式以位置服务为例，手机需要打开网络/连接有网络的热点且打开手机需要打开“位置”。
-   
-### 相关权限
 
+### 相关权限
 - 允许应用获取设备位置信息：ohos.permission.LOCATION
 - 允许应用在后台运行时获取设备位置信息：ohos.permission.LOCATION_IN_BACKGROUND
 - 允许应用获取设备模糊位置信息：ohos.permission.APPROXIMATELY_LOCATION
diff --git a/entry/src/main/ets/utils/SuspendTaskUtils.ets b/entry/src/main/ets/utils/SuspendTaskUtils.ets
index ec3fa8b784b4c9547b92d8915a294c2760c43cf7..d8bcc0d3af1c3ebdd6e0b0b86a6bc9ff86d55fd3 100644
--- a/entry/src/main/ets/utils/SuspendTaskUtils.ets
+++ b/entry/src/main/ets/utils/SuspendTaskUtils.ets
@@ -21,6 +21,8 @@ import { SuspendTaskInfo } from '../viewModel/SuspendTaskInfo';
 const TAG: string = '[SuspendTaskUtils]';
 
 class SuspendTaskUtils {
+  // DocsDode 1
+  // BackTaskImplement/entry/src/main/ets/utils/SuspendTaskUtils.ets
   /**
    *
    * @param reason Set the delay task suspension reason
@@ -51,7 +53,10 @@ class SuspendTaskUtils {
       return taskInfo;
     }
   }
+  // DocsDode 1
 
+  // DocsDode 2
+  // BackTaskImplement/entry/src/main/ets/utils/SuspendTaskUtils.ets
   async getRemainingDelayTime(id: number): Promise<number> {
     let delayTime: number = -1;
     await backgroundTaskManager.getRemainingDelayTime(id).then((res: number) => {
@@ -62,7 +67,10 @@ class SuspendTaskUtils {
     });
     return delayTime;
   }
+  // DocsDode 2
 
+  // DocsDode 3
+  // BackTaskImplement/entry/src/main/ets/utils/SuspendTaskUtils.ets
   cancelSuspendDelay(id: number): boolean {
     try {
       backgroundTaskManager.cancelSuspendDelay(id);
@@ -73,6 +81,7 @@ class SuspendTaskUtils {
     }
     return true;
   }
+  // DocsDode 3
 }
 
 let suspendTaskUtils = new SuspendTaskUtils();
diff --git a/entry/src/main/ets/view/LongTermTaskPage.ets b/entry/src/main/ets/view/LongTermTaskPage.ets
index 9d3ea107ec7ca5450c6be3fac20e35e8db7a0c84..0f2879fcf3f7a30442c3c15cab89169cbe6efc64 100644
--- a/entry/src/main/ets/view/LongTermTaskPage.ets
+++ b/entry/src/main/ets/view/LongTermTaskPage.ets
@@ -55,7 +55,10 @@ export struct LongTermTaskPage {
         Button($r('app.string.turn_off_location_services'))
           .buttonStyles()
           .onClick(async () => {
+            // DocsDode 1
+            // BackTaskImplement/entry/src/main/ets/view/LongTermTaskPage.ets
             geoLocationManager.off('locationChange');
+            // DocsDode 1
             this.longTermTaskModel.stopLongTask();
           })
       }
diff --git a/entry/src/main/ets/view/ShortTermTaskPage.ets b/entry/src/main/ets/view/ShortTermTaskPage.ets
index 74368618984c995bb393eb4c2b573dc04dff2f75..222eb6f1068896421fc641cf873c9bb7953cb74e 100644
--- a/entry/src/main/ets/view/ShortTermTaskPage.ets
+++ b/entry/src/main/ets/view/ShortTermTaskPage.ets
@@ -50,7 +50,10 @@ export struct ShortTermTaskPage {
   }
 
   build() {
+    // DocsDode 1
+    // BackTaskImplement/entry/src/main/ets/view/ShortTermTaskPage.ets
     NavDestination() {
+      // DocsDot
       Column() {
         Button($r('app.string.get_remaining_time'))
           .buttonStyles()
@@ -83,6 +86,7 @@ export struct ShortTermTaskPage {
       .justifyContent(FlexAlign.End)
       .height('100%')
       .width('100%')
+      // DocsDot
     }
     .title(this.builderTitle())
     .onAppear(() => {
@@ -92,6 +96,7 @@ export struct ShortTermTaskPage {
         hilog.info(0x0000, TAG, `already sent ：${this.messageCount} messages`);
       }, 2000);
     })
+    // DocsDode 1
     .onDisAppear(() => {
       clearInterval(this.taskTimer);
       SuspendTaskUtils.cancelSuspendDelay(this.shortTermTaskModel.suspendTaskInfo.id);
diff --git a/entry/src/main/ets/viewModel/LongTermTaskModel.ets b/entry/src/main/ets/viewModel/LongTermTaskModel.ets
index 45aaff295e7ee74c2bcd2048c2c6afc14d07a028..5d3ff6faa1a7b2092ccf4e1e5dcdf82696cb50d7 100644
--- a/entry/src/main/ets/viewModel/LongTermTaskModel.ets
+++ b/entry/src/main/ets/viewModel/LongTermTaskModel.ets
@@ -24,6 +24,8 @@ const TAG: string = '[LongTermTaskModel]';
 export class LongTermTaskModel {
   private context: common.UIAbilityContext = getContext(this) as common.UIAbilityContext;
 
+  // DocsDode 1
+  // BackTaskImplement/entry/src/main/ets/viewModel/LongTermTaskModel.ets
   // Apply for location-related permissions
   requestPermissionsFromUser(): void {
     let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager();
@@ -40,7 +42,10 @@ export class LongTermTaskModel {
         hilog.error(0x0000, TAG, `requestPermissionsFromUser fail: ${JSON.stringify(err)}`);
       });
   }
+  // DocsDode 1
 
+  // DocsDode 2
+  // BackTaskImplement/entry/src/main/ets/viewModel/LongTermTaskModel.ets
   locationCallback = async (location: geoLocationManager.Location) => {
     hilog.info(0x0000, TAG, `locationCallback: data: ${JSON.stringify(location)}`);
   };
@@ -60,7 +65,10 @@ export class LongTermTaskModel {
       hilog.error(0x0000, TAG, `errCode: ${JSON.stringify(err)}`);
     }
   }
+  // DocsDode 2
 
+  // DocsDode 3
+  // BackTaskImplement/entry/src/main/ets/viewModel/LongTermTaskModel.ets
   // Start a long task
   startLongTask(): void {
     let wantAgentInfo: wantAgent.WantAgentInfo = {
@@ -92,7 +100,10 @@ export class LongTermTaskModel {
       hilog.error(0x0000, TAG, `Operation getWantAgent failed. error is ${JSON.stringify(error)} `);
     }
   }
+  // DocsDode 3
 
+  // DocsDode 4
+  // BackTaskImplement/entry/src/main/ets/viewModel/LongTermTaskModel.ets
   // Stop a long task
   stopLongTask(): void {
     backgroundTaskManager.stopBackgroundRunning(this.context).then(() => {
@@ -101,4 +112,5 @@ export class LongTermTaskModel {
       hilog.error(0x0000, TAG, `Operation stopBackgroundRunning failed. error is ${JSON.stringify(error)} `);
     });
   }
+  // DocsDode 4
 }
\ No newline at end of file
diff --git a/entry/src/main/ets/viewModel/ShortTermTaskModel.ets b/entry/src/main/ets/viewModel/ShortTermTaskModel.ets
index 42b254a839d65328da4a04f33bda16a750b31dc4..5d458e046bf27a97508715e98d84ac2a988b7554 100644
--- a/entry/src/main/ets/viewModel/ShortTermTaskModel.ets
+++ b/entry/src/main/ets/viewModel/ShortTermTaskModel.ets
@@ -24,6 +24,8 @@ export class ShortTermTaskModel {
   public suspendTaskInfo: SuspendTaskInfo = { id: 0, delayTime: 0 };
   private context: common.UIAbilityContext = getContext(this) as common.UIAbilityContext;
 
+  // DocsDode 1
+  // BackTaskImplement/entry/src/main/ets/viewModel/ShortTermTaskModel.ets
   // Apply front - and back-end status monitoring
   subscribeStateChange() {
     let that = this;
@@ -49,6 +51,7 @@ export class ShortTermTaskModel {
         `error: ${(paramError as BusinessError).code}, ${(paramError as BusinessError).message}`);
     }
   }
+  // DocsDode 1
 
   offAppStateChange(): void {
     let applicationContext = this.context.getApplicationContext();
diff --git a/entry/src/main/ets/viewModel/SuspendTaskInfo.ets b/entry/src/main/ets/viewModel/SuspendTaskInfo.ets
index 4fa82d00243a3f00712757c0d97ec59902ca0542..c9da70fbe550cfca1fb7ec07080157a789f5cec1 100644
--- a/entry/src/main/ets/viewModel/SuspendTaskInfo.ets
+++ b/entry/src/main/ets/viewModel/SuspendTaskInfo.ets
@@ -13,7 +13,10 @@
  * limitations under the License.
  */
 
+// DocsDode 1
+// BackTaskImplement/entry/src/main/ets/viewModel/SuspendTaskInfo.ets
 export interface SuspendTaskInfo {
   id: number; // Short-time task ID
   delayTime: number; // The remaining time of this request short assignment
-}
\ No newline at end of file
+}
+// DocsDode 1
\ No newline at end of file
diff --git a/entry/src/main/module.json5 b/entry/src/main/module.json5
index 29434c09e837c7c689cc518ff1949c58dd4199e0..60829e540d3b44e1bef604da022299e6b465f60a 100644
--- a/entry/src/main/module.json5
+++ b/entry/src/main/module.json5
@@ -1,5 +1,8 @@
+// DocsDode 1
+// BackTaskImplement/entry/src/main/module.json5
 {
   "module": {
+    // DocsDot
     "name": "entry",
     "type": "entry",
     "description": "$string:module_desc",
@@ -10,10 +13,12 @@
     "deliveryWithInstall": true,
     "installationFree": false,
     "pages": "$profile:main_pages",
+    // DocsDot
     "abilities": [
       {
         "name": "EntryAbility",
         "srcEntry": "./ets/entryability/EntryAbility.ets",
+        // DocsDot
         "description": "$string:EntryAbility_desc",
         "icon": "$media:layered_image",
         "label": "$string:EntryAbility_label",
@@ -30,11 +35,13 @@
             ]
           }
         ],
+        // DocsDot
         "backgroundModes": [
           'location'
         ]
       }
     ],
+    // DocsDot
     "extensionAbilities": [
       {
         "name": "EntryBackupAbility",
@@ -49,9 +56,11 @@
         ]
       }
     ],
+    // DocsDot
     "requestPermissions": [
       {
         "name": "ohos.permission.LOCATION",
+        // DocsDot
         "reason": "$string:permission_location_desc",
         "usedScene": {
           "abilities": [
@@ -59,9 +68,11 @@
           ],
           "when": "inuse"
         }
+        // DocsDot
       },
       {
         "name": "ohos.permission.LOCATION_IN_BACKGROUND",
+        // DocsDot
         "reason": "$string:permission_location_background_desc",
         "usedScene": {
           "abilities": [
@@ -69,9 +80,11 @@
           ],
           "when": "inuse"
         }
+        // DocsDot
       },
       {
         "name": "ohos.permission.APPROXIMATELY_LOCATION",
+        // DocsDot
         "reason": "$string:permission_approximately_location_desc",
         "usedScene": {
           "abilities": [
@@ -79,9 +92,11 @@
           ],
           "when": "inuse"
         }
+        // DocsDot
       },
       {
         "name": "ohos.permission.KEEP_BACKGROUND_RUNNING",
+        // DocsDot
         "reason": "$string:permission_keep_background_running_desc",
         "usedScene": {
           "abilities": [
@@ -89,7 +104,9 @@
           ],
           "when": "inuse"
         }
+        // DocsDot
       }
     ]
   }
-}
\ No newline at end of file
+}
+// DocsDode 1
\ No newline at end of file