diff --git a/zh-cn/application-dev/reference/apis/js-apis-device-manager.md b/zh-cn/application-dev/reference/apis/js-apis-device-manager.md
index 12f57376017d2d14db806c93e39c4dfe530f2dc0..213bc65dc7fe2b0329f8292d845b37504cd39f93 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-device-manager.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-device-manager.md
@@ -61,7 +61,7 @@ createDeviceManager(bundleName: string, callback: AsyncCallback<DeviceManager
 | deviceName             | string                    | 是    | 设备名称。    |
 | deviceType             | [DeviceType](#devicetype) | 是    | 设备类型。    |
 | networkId<sup>8+</sup> | string                    | 是    | 设备网络标识。  |
-
+| rangge<sup>9+</sup>    | number                    | 是    | 发现设备的距离。  |
 
 ## DeviceType
 
@@ -401,13 +401,9 @@ startDeviceDiscovery(subscribeInfo: SubscribeInfo, filterOptions: string): void
   var filterOptions = {
     "filter_op": "AND",
     "filters": [
-        {
-            "type": "credible",
-            "value": 2
-        },
         {
             "type": "range",
-            "value": 50
+            "value": 50 // 需过滤发现设备的距离，单位(cm)
         }
     ]
 };