diff --git a/zh-cn/application-dev/reference/apis/js-apis-bluetooth.md b/zh-cn/application-dev/reference/apis/js-apis-bluetooth.md
index edab2c029b5d1a90ff1e45bc42457af7b5ce8066..a576c5494ab3f0314e895e5c8fbfc894da461900 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-bluetooth.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-bluetooth.md
@@ -233,6 +233,8 @@ cancelPairedDevice(deviceId: string): boolean
 
 删除配对的远程设备。
 
+此接口为系统接口。
+
 **需要权限**：ohos.permission.DISCOVER_BLUETOOTH
 
 **系统能力**：SystemCapability.Communication.Bluetooth.Core。
@@ -397,7 +399,7 @@ startBluetoothDiscovery(): boolean
 
 开启蓝牙扫描，可以发现远端设备。
 
-**需要权限**：ohos.permission.USE_BLUETOOTH；ohos.permission.LOCATION
+**需要权限**：ohos.permission.DISCOVER_BLUETOOTH；ohos.permission.LOCATION
 
 **系统能力**：SystemCapability.Communication.Bluetooth.Core。
 
@@ -1125,7 +1127,7 @@ startBLEScan(filters: Array<ScanFilter>, options?: ScanOptions): void
 
 发起BLE扫描流程。
 
-**需要权限**：ohos.permission.DISCOVER_BLUETOOTH；ohos.permission.MANAGE_BLUETOOTH；                           ohos.permission.LOCATION
+**需要权限**：ohos.permission.DISCOVER_BLUETOOTH；ohos.permission.MANAGE_BLUETOOTH；ohos.permission.LOCATION
 
 **系统能力**：SystemCapability.Communication.Bluetooth.Core。
 
@@ -1396,7 +1398,7 @@ A2dpSourceProfile.on('connectionStateChange', onReceiveEvent);
 
 ### A2dpSourceProfile.off('connectionStateChange')<sup>8+</sup>
 
-off(type: "connectionStateChange", callback: Callback&lt;[StateChangeParam](#StateChangeParam)&gt;): void
+off(type: "connectionStateChange", callback?: Callback&lt;[StateChangeParam](#StateChangeParam)&gt;): void
 
 取消订阅a2dp连接状态变化事件。
 
@@ -1423,12 +1425,14 @@ A2dpSourceProfile.off('connectionStateChange', onReceiveEvent);
 ```
 
 
-### getPlayingState
+### getPlayingState<sup>9+</sup>
 
 getPlayingState(device: string): PlayingState
 
 获取设备的播放状态。
 
+**需要权限**：ohos.permission.USE_BLUETOOTH
+
 **系统能力**：SystemCapability.Communication.Bluetooth.Core。
 
 **参数：**
@@ -1551,7 +1555,7 @@ HandsFreeAudioGatewayProfile.on('connectionStateChange', onReceiveEvent);
 
 ### HandsFreeAudioGatewayProfile.off('connectionStateChange')<sup>8+</sup>
 
-off(type: "connectionStateChange", callback: Callback&lt;[StateChangeParam](#StateChangeParam)&gt;): void
+off(type: "connectionStateChange", callback?: Callback&lt;[StateChangeParam](#StateChangeParam)&gt;): void
 
 取消订阅HFP连接状态变化事件。
 
@@ -1807,6 +1811,16 @@ server端特征值发生变化时，主动通知已连接的client设备。
 **示例：**
 
 ```js
+// 创建descriptors
+let descriptors = [];
+let arrayBuffer = new ArrayBuffer(8);
+let descV = new Uint8Array(arrayBuffer);
+descV[0] = 11;
+let descriptor = {serviceUuid: '00001810-0000-1000-8000-00805F9B34FB',
+  characteristicUuid: '00001820-0000-1000-8000-00805F9B34FB',
+  descriptorUuid: '00001830-0000-1000-8000-00805F9B34FB', descriptorValue: arrayBuffer};
+descriptors[0] = descriptor;
+
 let arrayBufferC = new ArrayBuffer(8);
 let characteristic = {serviceUuid: '00001810-0000-1000-8000-00805F9B34FB',
 characteristicUuid: '00001820-0000-1000-8000-00805F9B34FB', characteristicValue: arrayBufferC, descriptors:descriptors};
@@ -2385,14 +2399,9 @@ client端获取蓝牙低功耗设备的所有服务，即服务发现。
 
 ```js
 // Promise 模式
-let device = bluetooth.BLE.createGattClientDevice('XX:XX:XX:XX:XX:XX');
-device.connect();
-var services = device.getServices();
-console.log("bluetooth services size is ", services.length);
-
-for (let i = 0; i < services.length; i++) {
-    console.log('bluetooth serviceUuid is ' + services[i].serviceUuid);
-}
+gattClientDevice.getServices().then(result => {
+    console.info("getServices successfully:" + JSON.stringify(result));
+});
 ```
 
 
@@ -2725,6 +2734,16 @@ setNotifyCharacteristicChanged(characteristic: BLECharacteristic, enable: boolea
 **示例：**
 
 ```js
+// 创建descriptors
+let descriptors = [];
+let arrayBuffer = new ArrayBuffer(8);
+let descV = new Uint8Array(arrayBuffer);
+descV[0] = 11;
+let descriptor = {serviceUuid: '00001810-0000-1000-8000-00805F9B34FB',
+  characteristicUuid: '00001820-0000-1000-8000-00805F9B34FB',
+  descriptorUuid: '00001830-0000-1000-8000-00805F9B34FB', descriptorValue: arrayBuffer};
+descriptors[0] = descriptor;
+
 let arrayBufferC = new ArrayBuffer(8);
 let characteristic = {serviceUuid: '00001810-0000-1000-8000-00805F9B34FB',
   characteristicUuid: '00001820-0000-1000-8000-00805F9B34FB', characteristicValue: arrayBufferC, descriptors:descriptors};
diff --git a/zh-cn/application-dev/reference/apis/js-apis-system-bluetooth.md b/zh-cn/application-dev/reference/apis/js-apis-system-bluetooth.md
index 56d31795e0c9eb29d9356f4aa74a9f975e21fbeb..8c47784a03e047c85daa9afe99fe0eab5eae886a 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-system-bluetooth.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-system-bluetooth.md
@@ -130,19 +130,12 @@ ohos.permission.MANAGE_BLUETOOTH
 **示例：**
 
   ```
-  bluetooth.startBLEScan({
-    success() {
-      bluetooth.subscribeBLEFound({
-        success(data) {
-          const [device] = data.devices;
-          if (!!device) {
-            bluetooth.stopBLEScan();
-          }
-        }
-      });
+  bluetooth.subscribeBLEFound({
+    success(data) {
+      console.log('call bluetooth.subscribeBLEFound success, data: ${data}.');
     },
-    fail(code, data) {
-      console.log('Failed to start BLE device scan, code: ${code}, data: ${data}');
+    fail(data, code) {
+      console.log('call bluetooth.startBLEScan failed, data: ${data}, code: ${code}.');
     }
   });
   ```