diff --git a/target/tencent_sdk_trtc.lua b/target/tencent_sdk_trtc.lua
index b4cd8ed..b75a23e 100644
--- a/target/tencent_sdk_trtc.lua
+++ b/target/tencent_sdk_trtc.lua
@@ -20,5 +20,8 @@ end
 function tencent_sdk_trtc:dismissRoomByStrRoomId(secret_id,secret_key,sdkappid,room_id)
     return self.module:dismissRoomByStrRoomId(secret_id,secret_key,sdkappid,room_id)
 end
+function tencent_sdk_trtc:getUserSig(sdkappid,secret_key,user_id,expire_time)
+    return self.module:getUserSig(sdkappid,secret_key,user_id,expire_time)
+end
 
 return tencent_sdk_trtc