diff --git a/monitor/nacos.py b/monitor/nacos.py
index eccdb68..6b430c0 100644
--- a/monitor/nacos.py
+++ b/monitor/nacos.py
@@ -424,6 +424,8 @@ def build_nacos_payload() -> dict[str, Any]:
         raw_services = list_services(namespace["namespaceId"])
         # 这里保存当前 namespace 下所有待查询服务。
         queries_by_key: dict[tuple[str, str], dict[str, str]] = {}
+        # 只在可见 namespace，或者根本没有可见 namespace 时，才补 fallback 查询。
+        allow_fallback_queries = namespace["visible"] or not any(item["visible"] for item in normalized_namespaces)
 
         # 先收 service/list 返回的服务。
         for raw_name in raw_services:
@@ -438,11 +440,12 @@ def build_nacos_payload() -> dict[str, Any]:
             }
 
         # 再补上 targets.json 里已知的注册服务，避免 service/list 返回空时整页丢数据。
-        for item in monitored_service_queries():
-            queries_by_key.setdefault(
-                (item["groupName"], item["registryName"]),
-                item,
-            )
+        if allow_fallback_queries:
+            for item in monitored_service_queries():
+                queries_by_key.setdefault(
+                    (item["groupName"], item["registryName"]),
+                    item,
+                )
 
         # 逐个服务拉实例详情。
         for query in queries_by_key.values():