diff --git a/zh-cn/application-dev/device-usage-statistics/device-usage-statistics-dev-guide.md b/zh-cn/application-dev/device-usage-statistics/device-usage-statistics-dev-guide.md
index a0d5e22b3e34e673058f9ee5763c0bd54b645c95..f1925f41fd765aaef0b5c580f337c18bbac059aa 100644
--- a/zh-cn/application-dev/device-usage-statistics/device-usage-statistics-dev-guide.md
+++ b/zh-cn/application-dev/device-usage-statistics/device-usage-statistics-dev-guide.md
@@ -56,14 +56,14 @@ import stats from '@ohos.bundleState';
 
     // 异步方法callback方式
     stats.queryBundleActiveStates(0, 20000000000000, (err, res) => {
-        if(err.code == 0) {
+        if (err) {
+            console.log('BUNDLE_ACTIVE queryBundleActiveStates callback failed, because: ' + err.code);
+        } else {
             console.log('BUNDLE_ACTIVE queryBundleActiveStates callback success.');
             for (let i = 0; i < res.length; i++) {
                 console.log('BUNDLE_ACTIVE queryBundleActiveStates callback number : ' + (i + 1));
                 console.log('BUNDLE_ACTIVE queryBundleActiveStates callback result ' + JSON.stringify(res[i]));
             }
-        } else {
-            console.log('BUNDLE_ACTIVE queryBundleActiveStates callback failed, because: ' + err.code);
         }
     });
     ```
@@ -77,7 +77,7 @@ import stats from '@ohos.bundleState';
     stats.queryBundleStateInfos(0, 20000000000000).then( res => {
         console.log('BUNDLE_ACTIVE queryBundleStateInfos promise success.');
         let i = 1;
-        for(let key in res){
+        for (let key in res){
             console.log('BUNDLE_ACTIVE queryBundleStateInfos promise number : ' + i);
             console.log('BUNDLE_ACTIVE queryBundleStateInfos promise result ' + JSON.stringify(res[key]));
             i++;
@@ -88,7 +88,9 @@ import stats from '@ohos.bundleState';
 
     // 异步方法callback方式
     stats.queryBundleStateInfos(0, 20000000000000, (err, res) => {
-        if(err.code == 0) {
+        if (err) {
+            console.log('BUNDLE_ACTIVE queryBundleStateInfos callback failed, because: ' + err.code);
+        } else {
             console.log('BUNDLE_ACTIVE queryBundleStateInfos callback success.');
             let i = 1;
             for(let key in res){
@@ -96,8 +98,6 @@ import stats from '@ohos.bundleState';
                 console.log('BUNDLE_ACTIVE queryBundleStateInfos callback result ' + JSON.stringify(res[key]));
                 i++;
             }
-        } else {
-            console.log('BUNDLE_ACTIVE queryBundleStateInfos callback failed, because: ' + err.code);
         }
     });
     ```
@@ -120,14 +120,14 @@ import stats from '@ohos.bundleState';
 
     // 异步方法callback方式
     stats.queryCurrentBundleActiveStates(0, 20000000000000, (err, res) => {
-        if(err.code == 0) {
+        if (err) {
+            console.log('BUNDLE_ACTIVE queryCurrentBundleActiveStates callback failed, because: ' + err.code);
+        } else {
             console.log('BUNDLE_ACTIVE queryCurrentBundleActiveStates callback success.');
             for (let i = 0; i < res.length; i++) {
                 console.log('BUNDLE_ACTIVE queryCurrentBundleActiveStates callback number : ' + (i + 1));
                 console.log('BUNDLE_ACTIVE queryCurrentBundleActiveStates callback result ' + JSON.stringify(res[i]));
-             }
-        } else {
-            console.log('BUNDLE_ACTIVE queryCurrentBundleActiveStates callback failed, because: ' + err.code);
+            }
         }
     });
     ```
@@ -150,14 +150,14 @@ import stats from '@ohos.bundleState';
 
     // 异步方法callback方式
     stats.queryBundleStateInfoByInterval(0, 0, 20000000000000, (err, res) => {
-        if(err.code == 0) {
+        if (err) {
+            console.log('BUNDLE_ACTIVE queryBundleStateInfoByInterval callback failed, because: ' + err.code);
+        } else {
             console.log('BUNDLE_ACTIVE queryBundleStateInfoByInterval callback success.');
             for (let i = 0; i < res.length; i++) {
                 console.log('BUNDLE_ACTIVE queryBundleStateInfoByInterval callback number : ' + (i + 1));
                 console.log('BUNDLE_ACTIVE queryBundleStateInfoByInterval callback result ' + JSON.stringify(res[i]));
             }
-        } else {
-            console.log('BUNDLE_ACTIVE queryBundleStateInfoByInterval callback failed, because: ' + err.code);
         }
     });
     ```
@@ -176,10 +176,10 @@ import stats from '@ohos.bundleState';
 
     // 异步方法callback方式
     stats.queryAppUsagePriorityGroup((err, res) => {
-        if(err.code === 0) {
-            console.log('BUNDLE_ACTIVE queryAppUsagePriorityGroup callback succeeded. result: ' + JSON.stringify(res));
-        } else {
+        if (err) {
             console.log('BUNDLE_ACTIVE queryAppUsagePriorityGroup callback failed. because: ' + err.code);
+        } else {
+            console.log('BUNDLE_ACTIVE queryAppUsagePriorityGroup callback succeeded. result: ' + JSON.stringify(res));
         }
     });
     ```
@@ -198,10 +198,10 @@ import stats from '@ohos.bundleState';
 
     // 异步方法callback方式
     stats.isIdleState("com.ohos.camera", (err, res) => {
-        if(err.code === 0) {
-            console.log('BUNDLE_ACTIVE isIdleState callback succeeded, result: ' + JSON.stringify(res));
-        } else {
+        if (err) {
             console.log('BUNDLE_ACTIVE isIdleState callback failed, because: ' + err.code);
+        } else {
+            console.log('BUNDLE_ACTIVE isIdleState callback succeeded, result: ' + JSON.stringify(res));
         }
     });
     ```
\ No newline at end of file
diff --git a/zh-cn/application-dev/reference/apis/js-apis-deviceUsageStatistics.md b/zh-cn/application-dev/reference/apis/js-apis-deviceUsageStatistics.md
index 92dda87197d973ed71e4513026d59d12c8af6ad2..0a543bf63459d95724c5144b65052421e894a134 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-deviceUsageStatistics.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-deviceUsageStatistics.md
@@ -29,10 +29,10 @@ isIdleState(bundleName: string, callback: AsyncCallback&lt;boolean&gt;): void
 
   ```
     bundleState.isIdleState("com.ohos.camera", (err, res) => {
-        if(err.code === 0) {
-            console.log('BUNDLE_ACTIVE isIdleState callback succeeded, result: ' + JSON.stringify(res));
-        } else {
+        if (err) {
             console.log('BUNDLE_ACTIVE isIdleState callback failed, because: ' + err.code);
+        } else {
+            console.log('BUNDLE_ACTIVE isIdleState callback succeeded, result: ' + JSON.stringify(res));
         }
     });
   ```
@@ -85,10 +85,10 @@ queryAppUsagePriorityGroup(callback: AsyncCallback&lt;number&gt;): void
 
   ```
     bundleState.queryAppUsagePriorityGroup((err, res) => {
-        if(err.code === 0) {
-            console.log('BUNDLE_ACTIVE queryAppUsagePriorityGroup callback succeeded. result: ' + JSON.stringify(res));
-        } else {
+        if (err) {
             console.log('BUNDLE_ACTIVE queryAppUsagePriorityGroup callback failed. because: ' + err.code);
+        } else {
+            console.log('BUNDLE_ACTIVE queryAppUsagePriorityGroup callback succeeded. result: ' + JSON.stringify(res));
         }
     });
   ```
@@ -139,7 +139,9 @@ queryBundleStateInfos(begin: number, end: number, callback: AsyncCallback&lt;Bun
 
   ```
     bundleState.queryBundleStateInfos(0, 20000000000000, (err, res) => {
-        if(err.code == 0) {
+        if (err) {
+            console.log('BUNDLE_ACTIVE queryBundleStateInfos callback failed, because: ' + err.code);
+        } else {
             console.log('BUNDLE_ACTIVE queryBundleStateInfos callback success.');
             let i = 1;
             for(let key in res){
@@ -147,8 +149,6 @@ queryBundleStateInfos(begin: number, end: number, callback: AsyncCallback&lt;Bun
                 console.log('BUNDLE_ACTIVE queryBundleStateInfos callback result ' + JSON.stringify(res[key]));
                 i++;
             }
-        } else {
-            console.log('BUNDLE_ACTIVE queryBundleStateInfos callback failed, because: ' + err.code);
         }
     });
   ```
@@ -215,14 +215,14 @@ queryBundleStateInfoByInterval(byInterval: IntervalType, begin: number, end: num
 
   ```
     bundleState.queryBundleStateInfoByInterval(0, 0, 20000000000000, (err, res) => {
-        if(err.code == 0) {
+        if (err) {
+            console.log('BUNDLE_ACTIVE queryBundleStateInfoByInterval callback failed, because: ' + err.code);
+        } else {
             console.log('BUNDLE_ACTIVE queryBundleStateInfoByInterval callback success.');
             for (let i = 0; i < res.length; i++) {
                 console.log('BUNDLE_ACTIVE queryBundleStateInfoByInterval callback number : ' + (i + 1));
                 console.log('BUNDLE_ACTIVE queryBundleStateInfoByInterval callback result ' + JSON.stringify(res[i]));
             }
-        } else {
-            console.log('BUNDLE_ACTIVE queryBundleStateInfoByInterval callback failed, because: ' + err.code);
         }
     });
   ```
@@ -287,14 +287,14 @@ queryBundleActiveStates(begin: number, end: number, callback: AsyncCallback&lt;A
 
   ```
     bundleState.queryBundleActiveStates(0, 20000000000000, (err, res) => {
-        if(err.code == 0) {
+        if (err) {
+            console.log('BUNDLE_ACTIVE queryBundleActiveStates callback failed, because: ' + err.code);
+        } else {
             console.log('BUNDLE_ACTIVE queryBundleActiveStates callback success.');
             for (let i = 0; i < res.length; i++) {
                 console.log('BUNDLE_ACTIVE queryBundleActiveStates callback number : ' + (i + 1));
                 console.log('BUNDLE_ACTIVE queryBundleActiveStates callback result ' + JSON.stringify(res[i]));
             }
-        } else {
-            console.log('BUNDLE_ACTIVE queryBundleActiveStates callback failed, because: ' + err.code);
         }
     });
   ```
@@ -356,14 +356,14 @@ queryCurrentBundleActiveStates(begin: number, end: number, callback: AsyncCallba
 
   ```
     bundleState.queryCurrentBundleActiveStates(0, 20000000000000, (err, res) => {
-        if(err.code == 0) {
+        if (err) {
+            console.log('BUNDLE_ACTIVE queryCurrentBundleActiveStates callback failed, because: ' + err.code);
+        } else {
             console.log('BUNDLE_ACTIVE queryCurrentBundleActiveStates callback success.');
             for (let i = 0; i < res.length; i++) {
                 console.log('BUNDLE_ACTIVE queryCurrentBundleActiveStates callback number : ' + (i + 1));
                 console.log('BUNDLE_ACTIVE queryCurrentBundleActiveStates callback result ' + JSON.stringify(res[i]));
-             }
-        } else {
-            console.log('BUNDLE_ACTIVE queryCurrentBundleActiveStates callback failed, because: ' + err.code);
+            }
         }
     });
   ```