diff --git a/polaris-sync-registry-plugins/registry-consul/src/main/java/cn/polarismesh/polaris/sync/registry/plugins/consul/ConsulRegistryCenter.java b/polaris-sync-registry-plugins/registry-consul/src/main/java/cn/polarismesh/polaris/sync/registry/plugins/consul/ConsulRegistryCenter.java
index 0e1471f..64fd7e3 100644
--- a/polaris-sync-registry-plugins/registry-consul/src/main/java/cn/polarismesh/polaris/sync/registry/plugins/consul/ConsulRegistryCenter.java
+++ b/polaris-sync-registry-plugins/registry-consul/src/main/java/cn/polarismesh/polaris/sync/registry/plugins/consul/ConsulRegistryCenter.java
@@ -200,9 +200,11 @@ private List<Instance> convertConsulInstance(Service service, List<HealthService
         }
         Map<String, String> filters = (null == group ? null : group.getMetadataMap());
         for (HealthService healthService : instances) {
+            LOG.info("[Consul]convert instance {}", healthService);
             HealthService.Service instance = healthService.getService();
             Map<String, String> metadata = instance.getMeta();
             boolean matched = CommonUtils.matchMetadata(metadata, filters);
+            LOG.info("[Consul]convert instance {}, matched {}", healthService, matched);
             if (!matched) {
                 continue;
             }
@@ -211,7 +213,9 @@ private List<Instance> convertConsulInstance(Service service, List<HealthService
             builder.setService(ResponseUtils.toStringValue(service.getService()));
             builder.setHost(ResponseUtils.toStringValue(instance.getAddress()));
             builder.setPort(ResponseUtils.toUInt32Value(instance.getPort()));
-            builder.putAllMetadata(CommonUtils.defaultMap(instance.getMeta()));
+            if (!CollectionUtils.isEmpty(instance.getMeta())) {
+                builder.putAllMetadata(instance.getMeta());
+            }
             builder.setWeight(ResponseUtils.toUInt32Value(100));
             builder.setHealthy(ResponseUtils.toBooleanValue(true));
             builder.setIsolate(ResponseUtils.toBooleanValue(false));
diff --git a/polaris-sync-registry-plugins/registry-nacos/src/main/java/cn/polarismesh/polaris/sync/registry/plugins/nacos/NacosRegistryCenter.java b/polaris-sync-registry-plugins/registry-nacos/src/main/java/cn/polarismesh/polaris/sync/registry/plugins/nacos/NacosRegistryCenter.java
index fac1fab..52a7313 100644
--- a/polaris-sync-registry-plugins/registry-nacos/src/main/java/cn/polarismesh/polaris/sync/registry/plugins/nacos/NacosRegistryCenter.java
+++ b/polaris-sync-registry-plugins/registry-nacos/src/main/java/cn/polarismesh/polaris/sync/registry/plugins/nacos/NacosRegistryCenter.java
@@ -272,7 +272,9 @@ private List<ServiceProto.Instance> convertNacosInstances(Service service, List<
             builder.setNamespace(ResponseUtils.toStringValue(service.getNamespace()));
             builder.setService(ResponseUtils.toStringValue(service.getService()));
             builder.setWeight(ResponseUtils.toUInt32Value((int) weight));
-            builder.putAllMetadata(CommonUtils.defaultMap(metadata));
+            if (!CollectionUtils.isEmpty(metadata)) {
+                builder.putAllMetadata(metadata);
+            }
             builder.setHost(ResponseUtils.toStringValue(ip));
             builder.setPort(ResponseUtils.toUInt32Value(port));
             builder.setIsolate(ResponseUtils.toBooleanValue(!enabled));
diff --git a/polaris-sync-registry-plugins/registry-polaris/src/main/java/cn/polarismesh/polaris/sync/registry/plugins/polaris/PolarisRegistryCenter.java b/polaris-sync-registry-plugins/registry-polaris/src/main/java/cn/polarismesh/polaris/sync/registry/plugins/polaris/PolarisRegistryCenter.java
index 6f985ed..05c1304 100644
--- a/polaris-sync-registry-plugins/registry-polaris/src/main/java/cn/polarismesh/polaris/sync/registry/plugins/polaris/PolarisRegistryCenter.java
+++ b/polaris-sync-registry-plugins/registry-polaris/src/main/java/cn/polarismesh/polaris/sync/registry/plugins/polaris/PolarisRegistryCenter.java
@@ -197,7 +197,9 @@ private List<ServiceProto.Instance> convertPolarisInstances(com.tencent.polaris.
             ServiceProto.Instance.Builder builder = ServiceProto.Instance.newBuilder();
             builder.setId(ResponseUtils.toStringValue(instanceId));
             builder.setWeight(ResponseUtils.toUInt32Value(instance.getWeight()));
-            builder.putAllMetadata(CommonUtils.defaultMap(metadata));
+            if (CollectionUtils.isEmpty(metadata)) {
+                builder.putAllMetadata(metadata);
+            }
             builder.setHost(ResponseUtils.toStringValue(ip));
             builder.setPort(ResponseUtils.toUInt32Value(port));
             builder.setIsolate(ResponseUtils.toBooleanValue(instance.isIsolated()));