diff --git a/zh-cn/application-dev/connectivity/net-mdns.md b/zh-cn/application-dev/connectivity/net-mdns.md
index bfbe5a9019e2744dcf34be3c1130b116d440e10e..5a68ec8de3cb157d3b0c5729d6e53a3098a3d1bd 100644
--- a/zh-cn/application-dev/connectivity/net-mdns.md
+++ b/zh-cn/application-dev/connectivity/net-mdns.md
@@ -32,9 +32,9 @@ MDNS管理的典型场景有：
 | ohos.net.mdns.DiscoveryService | on(type: 'discoveryStop', callback: Callback<{serviceInfo: LocalServiceInfo, errorCode?: MdnsError}>): void | 订阅停止监听mDNS服务的通知。 |
 | ohos.net.mdns.DiscoveryService | off(type: 'discoveryStop', callback?: Callback<{ serviceInfo: LocalServiceInfo, errorCode?: MdnsError }>): void | 取消停止监听mDNS服务的通知。 |
 | ohos.net.mdns.DiscoveryService | on(type: 'serviceFound', callback: Callback\<LocalServiceInfo>): void | 订阅发现mDNS服务的通知。 |
-| ohos.net.mdns.DiscoveryService | off(type: 'serviceFound', callback?: Callback<LocalServiceInfo>): void | 取消发现mDNS服务的通知。 |
+| ohos.net.mdns.DiscoveryService | off(type: 'serviceFound', callback?: Callback\<LocalServiceInfo>): void | 取消发现mDNS服务的通知。 |
 | ohos.net.mdns.DiscoveryService | on(type: 'serviceLost', callback: Callback\<LocalServiceInfo>): void | 订阅移除mDNS服务的通知。 |
-| ohos.net.mdns.DiscoveryService | off(type: 'serviceLost', callback?: Callback<LocalServiceInfo>): void | 取消移除mDNS服务的通知。 |
+| ohos.net.mdns.DiscoveryService | off(type: 'serviceLost', callback?: Callback\<LocalServiceInfo>): void | 取消移除mDNS服务的通知。 |
 
 ## 管理本地服务
 
@@ -158,4 +158,4 @@ discoveryService.off('serviceFound', (data) => {
 discoveryService.off('serviceLost', (data) => {
   console.log(JSON.stringify(data));
 });
-```
\ No newline at end of file
+```
diff --git a/zh-cn/application-dev/reference/apis/js-apis-net-mdns.md b/zh-cn/application-dev/reference/apis/js-apis-net-mdns.md
index 507f3db6c2ecaa69c5d6f657a3ee6dde0ce9a84e..9b7bfba8e211e12b1884991b9dbaaa08749b224a 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-net-mdns.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-net-mdns.md
@@ -852,7 +852,7 @@ discoveryService.stopSearchingMDNS();
 
 ### off('serviceFound')<sup>10+</sup>
 
-off(type: 'serviceFound', callback?: Callback<LocalServiceInfo>): void
+off(type: 'serviceFound', callback?: Callback\<LocalServiceInfo>): void
 
 取消订阅发现mDNS服务的通知。
 
@@ -918,7 +918,7 @@ discoveryService.stopSearchingMDNS();
 
 ### off('serviceLost')<sup>10+</sup>
 
-off(type: 'serviceLost', callback?: Callback<LocalServiceInfo>): void
+off(type: 'serviceLost', callback?: Callback\<LocalServiceInfo>): void
 
 取消订阅移除mDNS服务的通知。