diff --git a/proxy/src/main/java/org/apache/rocketmq/proxy/grpc/v2/common/GrpcValidator.java b/proxy/src/main/java/org/apache/rocketmq/proxy/grpc/v2/common/GrpcValidator.java
index 106f76f46e..cfcd2a2693 100644
--- a/proxy/src/main/java/org/apache/rocketmq/proxy/grpc/v2/common/GrpcValidator.java
+++ b/proxy/src/main/java/org/apache/rocketmq/proxy/grpc/v2/common/GrpcValidator.java
@@ -52,17 +52,14 @@ public class GrpcValidator {
     }
 
     public void validateTopic(String topicName) {
-        if (StringUtils.isBlank(topicName)) {
-            throw new GrpcProxyException(Code.ILLEGAL_TOPIC, "topic name cannot be empty");
-        }
-        if (TopicValidator.isSystemTopic(topicName)) {
-            throw new GrpcProxyException(Code.ILLEGAL_TOPIC, "cannot access system topic");
-        }
         try {
             Validators.checkTopic(topicName);
         } catch (MQClientException mqClientException) {
             throw new GrpcProxyException(Code.ILLEGAL_TOPIC, mqClientException.getErrorMessage());
         }
+        if (TopicValidator.isSystemTopic(topicName)) {
+            throw new GrpcProxyException(Code.ILLEGAL_TOPIC, "cannot access system topic");
+        }
     }
 
     public void validateConsumerGroup(Resource consumerGroup) {
@@ -70,17 +67,14 @@ public class GrpcValidator {
     }
 
     public void validateConsumerGroup(String consumerGroupName) {
-        if (StringUtils.isBlank(consumerGroupName)) {
-            throw new GrpcProxyException(Code.ILLEGAL_CONSUMER_GROUP, "consumer group cannot be empty");
-        }
-        if (MixAll.isSysConsumerGroup(consumerGroupName)) {
-            throw new GrpcProxyException(Code.ILLEGAL_CONSUMER_GROUP, "cannot use system consumer group");
-        }
         try {
             Validators.checkGroup(consumerGroupName);
         } catch (MQClientException mqClientException) {
             throw new GrpcProxyException(Code.ILLEGAL_CONSUMER_GROUP, mqClientException.getErrorMessage());
         }
+        if (MixAll.isSysConsumerGroup(consumerGroupName)) {
+            throw new GrpcProxyException(Code.ILLEGAL_CONSUMER_GROUP, "cannot use system consumer group");
+        }
     }
 
     public void validateTopicAndConsumerGroup(Resource topic, Resource consumerGroup) {
diff --git a/proxy/src/test/java/org/apache/rocketmq/proxy/grpc/v2/common/GrpcValidatorTest.java b/proxy/src/test/java/org/apache/rocketmq/proxy/grpc/v2/common/GrpcValidatorTest.java
new file mode 100644
index 0000000000..df42844e95
--- /dev/null
+++ b/proxy/src/test/java/org/apache/rocketmq/proxy/grpc/v2/common/GrpcValidatorTest.java
@@ -0,0 +1,47 @@
+/*
+ * 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.proxy.grpc.v2.common;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.assertThrows;
+
+public class GrpcValidatorTest {
+
+    private GrpcValidator grpcValidator;
+
+    @Before
+    public void before() {
+        this.grpcValidator = GrpcValidator.getInstance();
+    }
+
+    @Test
+    public void testValidateTopic() {
+        assertThrows(GrpcProxyException.class, () -> grpcValidator.validateTopic(""));
+        assertThrows(GrpcProxyException.class, () -> grpcValidator.validateTopic("rmq_sys_xxxx"));
+        grpcValidator.validateTopic("topicName");
+    }
+
+    @Test
+    public void testValidateConsumerGroup() {
+        assertThrows(GrpcProxyException.class, () -> grpcValidator.validateConsumerGroup(""));
+        assertThrows(GrpcProxyException.class, () -> grpcValidator.validateConsumerGroup("CID_RMQ_SYS_xxxx"));
+        grpcValidator.validateConsumerGroup("consumerGroupName");
+    }
+}