diff --git a/nacos/client.py b/nacos/client.py
index 69efb80..e5248b9 100644
--- a/nacos/client.py
+++ b/nacos/client.py
@@ -1152,6 +1152,9 @@ def send_heartbeat(self, service_name, ip, port, cluster_name=None, weight=1.0,
                        group_name=DEFAULT_GROUP_NAME):
         logger.info("[send-heartbeat] ip:%s, port:%s, service_name:%s, namespace:%s" % (ip, port, service_name,
                                                                                         self.namespace))
+        if "@@" not in service_name and group_name:
+            service_name = group_name + "@@" + service_name
+
         beat_data = {
             "serviceName": service_name,
             "ip": ip,
@@ -1287,4 +1290,4 @@ def stop_subscribe(self):
         stop subscribe timer scheduler
         :return: 
         """
-        self.subscribe_timer_manager.stop()
\ No newline at end of file
+        self.subscribe_timer_manager.stop()