diff --git a/polaris-discovery/polaris-discovery-client/src/main/java/com/tencent/polaris/discovery/client/util/Validator.java b/polaris-discovery/polaris-discovery-client/src/main/java/com/tencent/polaris/discovery/client/util/Validator.java
index 5d2f20645..c686db364 100644
--- a/polaris-discovery/polaris-discovery-client/src/main/java/com/tencent/polaris/discovery/client/util/Validator.java
+++ b/polaris-discovery/polaris-discovery-client/src/main/java/com/tencent/polaris/discovery/client/util/Validator.java
@@ -24,25 +24,13 @@
 import com.tencent.polaris.api.pojo.RetStatus;
 import com.tencent.polaris.api.pojo.ServiceEventKey;
 import com.tencent.polaris.api.pojo.ServiceKey;
-import com.tencent.polaris.api.rpc.BaseEntity;
-import com.tencent.polaris.api.rpc.GetAllInstancesRequest;
-import com.tencent.polaris.api.rpc.GetHealthyInstancesRequest;
-import com.tencent.polaris.api.rpc.GetInstancesRequest;
-import com.tencent.polaris.api.rpc.GetOneInstanceRequest;
-import com.tencent.polaris.api.rpc.GetResourcesRequest;
-import com.tencent.polaris.api.rpc.GetServiceContractRequest;
-import com.tencent.polaris.api.rpc.GetServiceRuleRequest;
-import com.tencent.polaris.api.rpc.InstanceDeregisterRequest;
-import com.tencent.polaris.api.rpc.InstanceHeartbeatRequest;
-import com.tencent.polaris.api.rpc.InstanceRegisterRequest;
-import com.tencent.polaris.api.rpc.ServiceCallResult;
-import com.tencent.polaris.api.rpc.UnWatchServiceRequest;
-import com.tencent.polaris.api.rpc.WatchServiceRequest;
+import com.tencent.polaris.api.rpc.*;
 import com.tencent.polaris.api.utils.CollectionUtils;
 import com.tencent.polaris.api.utils.StringUtils;
 import com.tencent.polaris.client.util.CommonValidator;
+import com.tencent.polaris.logging.LoggerFactory;
+import org.slf4j.Logger;
 
-import java.util.Objects;
 import java.util.Set;
 
 /**
@@ -53,6 +41,8 @@
  */
 public class Validator {
 
+    private static final Logger LOG = LoggerFactory.getLogger(Validator.class);
+
     private static final int MAX_PORT = 65536;
 
     /**
@@ -164,7 +154,7 @@ public static void validateServiceCallResult(ServiceCallResult serviceCallResult
             throw new PolarisException(ErrorCode.API_INVALID_ARGUMENT, "delay can not be less than 0");
         }
         if (!RetStatus.RetReject.equals(serviceCallResult.getRetStatus())) {
-            validateHostPort(serviceCallResult.getHost(), serviceCallResult.getPort());
+            validateServiceCallResultHostPort(serviceCallResult.getHost(), serviceCallResult.getPort());
         }
     }
 
@@ -187,6 +177,29 @@ private static void validateHostPort(String host, Integer port) throws PolarisEx
         }
     }
 
+    /**
+     * 校验服务请求端口信息。某些场景下端口号为0，例如Dubbo的本地调用。
+     *
+     * @param host
+     * @param port
+     * @throws PolarisException
+     */
+    private static void validateServiceCallResultHostPort(String host, Integer port) throws PolarisException {
+        if (StringUtils.isBlank(host)) {
+            throw new PolarisException(ErrorCode.API_INVALID_ARGUMENT, "host can not be blank");
+        }
+        if (port == null) {
+            throw new PolarisException(ErrorCode.API_INVALID_ARGUMENT, "port can not be null");
+        }
+        if (port == 0) {
+            LOG.warn("port is 0 with host {}. Please check if it meets expectations.", host);
+        }
+        if (port < 0 || port >= MAX_PORT) {
+            throw new PolarisException(
+                    ErrorCode.API_INVALID_ARGUMENT, "port value should be in range [0, 65536).");
+        }
+    }
+
     /**
      * 校验实例注册请求
      *
diff --git a/polaris-discovery/polaris-discovery-client/src/test/java/com/tencent/polaris/discovery/client/util/ValidatorTest.java b/polaris-discovery/polaris-discovery-client/src/test/java/com/tencent/polaris/discovery/client/util/ValidatorTest.java
new file mode 100644
index 000000000..4712f7159
--- /dev/null
+++ b/polaris-discovery/polaris-discovery-client/src/test/java/com/tencent/polaris/discovery/client/util/ValidatorTest.java
@@ -0,0 +1,24 @@
+/*
+ * Tencent is pleased to support the open source community by making polaris-java available.
+ *
+ * Copyright (C) 2021 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package com.tencent.polaris.discovery.client.util;
+
+/**
+ * @author Haotian Zhang
+ */
+public class ValidatorTest {
+}
diff --git a/polaris-plugins/polaris-plugins-observability/event-tsf/src/main/java/com/tencent/polaris/plugins/event/tsf/TsfEventReporter.java b/polaris-plugins/polaris-plugins-observability/event-tsf/src/main/java/com/tencent/polaris/plugins/event/tsf/TsfEventReporter.java
index 6ad848fc5..e93d076a6 100644
--- a/polaris-plugins/polaris-plugins-observability/event-tsf/src/main/java/com/tencent/polaris/plugins/event/tsf/TsfEventReporter.java
+++ b/polaris-plugins/polaris-plugins-observability/event-tsf/src/main/java/com/tencent/polaris/plugins/event/tsf/TsfEventReporter.java
@@ -29,9 +29,9 @@
 import com.tencent.polaris.api.plugin.common.PluginTypes;
 import com.tencent.polaris.api.plugin.compose.Extensions;
 import com.tencent.polaris.api.plugin.event.BaseEvent;
+import com.tencent.polaris.api.plugin.event.EventConstants;
 import com.tencent.polaris.api.plugin.event.EventReporter;
 import com.tencent.polaris.api.plugin.event.FlowEvent;
-import com.tencent.polaris.api.pojo.ServiceEventKey;
 import com.tencent.polaris.api.utils.CollectionUtils;
 import com.tencent.polaris.api.utils.StringUtils;
 import com.tencent.polaris.api.utils.ThreadPoolUtils;
@@ -102,10 +102,9 @@ public boolean isEnabled() {
     @Override
     public boolean reportEvent(BaseEvent baseEvent) {
         if (baseEvent instanceof FlowEvent) {
-            if (baseEvent.getEventType().equals(ServiceEventKey.EventType.CIRCUIT_BREAKING)) {
+            if (baseEvent.getEventType().equals(EventConstants.EventType.CIRCUIT_BREAKING)) {
                 return reportV1Event((FlowEvent) baseEvent);
-            }
-            else if (baseEvent.getEventType().equals(ServiceEventKey.EventType.RATE_LIMITING)) {
+            } else if (baseEvent.getEventType().equals(EventConstants.EventType.RATE_LIMITING)) {
                 return reportReportEvent((FlowEvent) baseEvent);
             }
         }