diff --git a/namesrv/src/test/java/org/apache/rocketmq/namesrv/routeinfo/RouteInfoManagerNewTest.java b/namesrv/src/test/java/org/apache/rocketmq/namesrv/routeinfo/RouteInfoManagerNewTest.java
index 6002d1f5a4d..b256aa5d763 100644
--- a/namesrv/src/test/java/org/apache/rocketmq/namesrv/routeinfo/RouteInfoManagerNewTest.java
+++ b/namesrv/src/test/java/org/apache/rocketmq/namesrv/routeinfo/RouteInfoManagerNewTest.java
@@ -23,6 +23,7 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.List;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
@@ -33,6 +34,7 @@
 import org.apache.rocketmq.common.namesrv.NamesrvConfig;
 import org.apache.rocketmq.remoting.protocol.DataVersion;
 import org.apache.rocketmq.remoting.protocol.body.ClusterInfo;
+import org.apache.rocketmq.remoting.protocol.body.ConcurrentTopicList;
 import org.apache.rocketmq.remoting.protocol.body.TopicConfigSerializeWrapper;
 import org.apache.rocketmq.remoting.protocol.body.TopicList;
 import org.apache.rocketmq.remoting.protocol.header.namesrv.UnRegisterBrokerRequestHeader;
@@ -131,6 +133,24 @@ public void getAllTopicList() {
         assertThat(topicList.getTopicList()).contains("TestTopic", "TestTopic1", "TestTopic2");
     }
 
+    @Test
+    public void hugeTopicListAddTest() {
+        TopicList topicList = new TopicList();
+        ConcurrentTopicList concurrentTopicList = new ConcurrentTopicList();
+        HashSet<String> topics= new HashSet<>();
+        for(int i=0; i< 100000 ; ++i) {
+            topics.add("Topic" + i);
+        }
+        long startTime = System.currentTimeMillis();
+        topicList.getTopicList().addAll(topics);
+        long endTime = System.currentTimeMillis();
+        assertThat(endTime - startTime < 1000).isTrue();
+        startTime = System.currentTimeMillis();
+        concurrentTopicList.getTopicList().addAll(topics);
+        endTime = System.currentTimeMillis();
+        assertThat(endTime - startTime > 3000).isTrue();
+    }
+
     @Test
     public void registerBroker() {
         // Register master broker
diff --git a/remoting/src/main/java/org/apache/rocketmq/remoting/protocol/body/ConcurrentTopicList.java b/remoting/src/main/java/org/apache/rocketmq/remoting/protocol/body/ConcurrentTopicList.java
new file mode 100644
index 00000000000..4161c9c13a2
--- /dev/null
+++ b/remoting/src/main/java/org/apache/rocketmq/remoting/protocol/body/ConcurrentTopicList.java
@@ -0,0 +1,42 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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 org.apache.rocketmq.remoting.protocol.body;
+
+import java.util.Set;
+import java.util.concurrent.CopyOnWriteArraySet;
+import org.apache.rocketmq.remoting.protocol.RemotingSerializable;
+
+public class ConcurrentTopicList extends RemotingSerializable {
+    private Set<String> topicList = new CopyOnWriteArraySet<>();
+    private String brokerAddr;
+
+    public Set<String> getTopicList() {
+        return topicList;
+    }
+
+    public void setTopicList(Set<String> topicList) {
+        this.topicList = topicList;
+    }
+
+    public String getBrokerAddr() {
+        return brokerAddr;
+    }
+
+    public void setBrokerAddr(String brokerAddr) {
+        this.brokerAddr = brokerAddr;
+    }
+}
diff --git a/remoting/src/main/java/org/apache/rocketmq/remoting/protocol/body/TopicList.java b/remoting/src/main/java/org/apache/rocketmq/remoting/protocol/body/TopicList.java
index 30edfb5a987..93770e9db1f 100644
--- a/remoting/src/main/java/org/apache/rocketmq/remoting/protocol/body/TopicList.java
+++ b/remoting/src/main/java/org/apache/rocketmq/remoting/protocol/body/TopicList.java
@@ -16,12 +16,12 @@
  */
 package org.apache.rocketmq.remoting.protocol.body;
 
+import java.util.HashSet;
 import java.util.Set;
-import java.util.concurrent.CopyOnWriteArraySet;
 import org.apache.rocketmq.remoting.protocol.RemotingSerializable;
 
 public class TopicList extends RemotingSerializable {
-    private Set<String> topicList = new CopyOnWriteArraySet<>();
+    private Set<String> topicList = new HashSet<>();
     private String brokerAddr;
 
     public Set<String> getTopicList() {
diff --git a/tools/src/main/java/org/apache/rocketmq/tools/admin/DefaultMQAdminExt.java b/tools/src/main/java/org/apache/rocketmq/tools/admin/DefaultMQAdminExt.java
index 40bd5d56d30..04b754c7d62 100644
--- a/tools/src/main/java/org/apache/rocketmq/tools/admin/DefaultMQAdminExt.java
+++ b/tools/src/main/java/org/apache/rocketmq/tools/admin/DefaultMQAdminExt.java
@@ -46,6 +46,7 @@
 import org.apache.rocketmq.remoting.protocol.body.BrokerStatsData;
 import org.apache.rocketmq.remoting.protocol.body.ClusterAclVersionInfo;
 import org.apache.rocketmq.remoting.protocol.body.ClusterInfo;
+import org.apache.rocketmq.remoting.protocol.body.ConcurrentTopicList;
 import org.apache.rocketmq.remoting.protocol.body.ConsumeMessageDirectlyResult;
 import org.apache.rocketmq.remoting.protocol.body.ConsumeStatsList;
 import org.apache.rocketmq.remoting.protocol.body.ConsumerConnection;
@@ -505,7 +506,7 @@ public TopicList queryTopicsByConsumer(String group)
     }
 
     @Override
-    public AdminToolResult<TopicList> queryTopicsByConsumerConcurrent(String group) {
+    public AdminToolResult<ConcurrentTopicList> queryTopicsByConsumerConcurrent(String group) {
         return defaultMQAdminExtImpl.queryTopicsByConsumerConcurrent(group);
     }
 
diff --git a/tools/src/main/java/org/apache/rocketmq/tools/admin/DefaultMQAdminExtImpl.java b/tools/src/main/java/org/apache/rocketmq/tools/admin/DefaultMQAdminExtImpl.java
index 331b24d6068..ce568b98998 100644
--- a/tools/src/main/java/org/apache/rocketmq/tools/admin/DefaultMQAdminExtImpl.java
+++ b/tools/src/main/java/org/apache/rocketmq/tools/admin/DefaultMQAdminExtImpl.java
@@ -84,6 +84,7 @@
 import org.apache.rocketmq.remoting.protocol.body.BrokerStatsData;
 import org.apache.rocketmq.remoting.protocol.body.ClusterAclVersionInfo;
 import org.apache.rocketmq.remoting.protocol.body.ClusterInfo;
+import org.apache.rocketmq.remoting.protocol.body.ConcurrentTopicList;
 import org.apache.rocketmq.remoting.protocol.body.ConsumeMessageDirectlyResult;
 import org.apache.rocketmq.remoting.protocol.body.ConsumeStatsList;
 import org.apache.rocketmq.remoting.protocol.body.ConsumerConnection;
@@ -1084,7 +1085,7 @@ public TopicList queryTopicsByConsumer(
     }
 
     @Override
-    public AdminToolResult<TopicList> queryTopicsByConsumerConcurrent(final String group) {
+    public AdminToolResult<ConcurrentTopicList> queryTopicsByConsumerConcurrent(final String group) {
         return adminToolExecute(new AdminToolHandler() {
             @Override
             public AdminToolResult doExecute() throws Exception {
@@ -1094,7 +1095,7 @@ public AdminToolResult doExecute() throws Exception {
                 if (topicRouteData == null || CollectionUtils.isEmpty(topicRouteData.getBrokerDatas())) {
                     return AdminToolResult.failure(AdminToolsResultCodeEnum.TOPIC_ROUTE_INFO_NOT_EXIST, "router info not found.");
                 }
-                final TopicList result = new TopicList();
+                final ConcurrentTopicList result = new ConcurrentTopicList();
                 final CountDownLatch latch = new CountDownLatch(topicRouteData.getBrokerDatas().size());
                 for (final BrokerData bd : topicRouteData.getBrokerDatas()) {
                     threadPoolExecutor.submit(new Runnable() {
diff --git a/tools/src/main/java/org/apache/rocketmq/tools/admin/MQAdminExt.java b/tools/src/main/java/org/apache/rocketmq/tools/admin/MQAdminExt.java
index 3148fc0987e..f043363b25f 100644
--- a/tools/src/main/java/org/apache/rocketmq/tools/admin/MQAdminExt.java
+++ b/tools/src/main/java/org/apache/rocketmq/tools/admin/MQAdminExt.java
@@ -42,6 +42,7 @@
 import org.apache.rocketmq.remoting.protocol.body.BrokerStatsData;
 import org.apache.rocketmq.remoting.protocol.body.ClusterAclVersionInfo;
 import org.apache.rocketmq.remoting.protocol.body.ClusterInfo;
+import org.apache.rocketmq.remoting.protocol.body.ConcurrentTopicList;
 import org.apache.rocketmq.remoting.protocol.body.ConsumeMessageDirectlyResult;
 import org.apache.rocketmq.remoting.protocol.body.ConsumeStatsList;
 import org.apache.rocketmq.remoting.protocol.body.ConsumerConnection;
@@ -243,7 +244,7 @@ GroupList queryTopicConsumeByWho(final String topic) throws RemotingConnectExcep
     TopicList queryTopicsByConsumer(
         final String group) throws InterruptedException, MQBrokerException, RemotingException, MQClientException;
 
-    AdminToolResult<TopicList> queryTopicsByConsumerConcurrent(final String group);
+    AdminToolResult<ConcurrentTopicList> queryTopicsByConsumerConcurrent(final String group);
 
     SubscriptionData querySubscription(final String group,
         final String topic) throws InterruptedException, MQBrokerException, RemotingException, MQClientException;