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 213bc65dc7fe2b0329f8292d845b37504cd39f93..05b69263ce3099fe4f35a7f643fe9533fa77028d 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
@@ -407,7 +407,7 @@ startDeviceDiscovery(subscribeInfo: SubscribeInfo, filterOptions: string): void
         }
     ]
 };
-  dmInstance.startDeviceDiscovery(subscribeInfo, filterOptions); //当有设备发现时，通过deviceFound回调通知给应用程序
+  dmInstance.startDeviceDiscovery(subscribeInfo, JSON.stringify(filterOptions)); //当有设备发现时，通过deviceFound回调通知给应用程序
   ```
   
 ### stopDeviceDiscovery