diff --git a/flask-consul/units/cloud/sync_ecs.py b/flask-consul/units/cloud/sync_ecs.py
index 850d5f3..d958863 100644
--- a/flask-consul/units/cloud/sync_ecs.py
+++ b/flask-consul/units/cloud/sync_ecs.py
@@ -77,7 +77,8 @@ def w2consul(vendor,account,region,ecs_dict):
         if vendor == 'tencent_cloud' and v['ecstag'] != []:
             ecstag_dict = {}
             for ecstag in v['ecstag']:
-                ecstag_dict[ecstag.Key] = ecstag.Value
+                if ecstag.Key.encode().isalnum():
+                    ecstag_dict[ecstag.Key] = ecstag.Value
             data['Meta'].update(ecstag_dict)
         
         reg = requests.put(puturl, headers=headers, data=json.dumps(data))