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 926bc3aaad951784a61b55dac94c213da2aa6681..038351f73d3c7e42fe2197fd2d301df246f77e3f 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);
         }
     });
     ```
@@ -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));
         }
     });
     ```
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