     message: ''
 
   new Promise (resolve, reject) ->
-    rongCloud.message.group.publish encodedUserId, encodedGroupId, 'RC:GrpNtf', groupNotificationMessage,
+    rongCloud.message.group.publish '__system__', encodedGroupId, 'RC:GrpNtf', groupNotificationMessage,
       (err, resultText) ->
         # 暂不考虑回调的结果是否成功，后续可以考虑记录到系统错误日志中
         if err

              transaction: t
          ]
      .then ->
        # 更新版本号（时间戳）
        DataVersion.updateGroupMemberVersion groupId, timestamp
        .then ->

            GROUP_OPERATION_QUIT,
            data:
              operatorNickname: currentUserNickname
              targetUserIds: encodedMemberIds
              targetUserDisplayNames: [currentUserNickname]
              timestamp: timestamp
          .then ->
