diff --git a/example/config.js b/example/config.js
index 2d5dd3d..41abbfb 100644
--- a/example/config.js
+++ b/example/config.js
@@ -12,6 +12,6 @@ module.exports = {
   consumerGroup: 'GID_alions',
   topic: 'TP_alions_test_topic',
   // https://help.aliyun.com/document_detail/102895.html 阿里云产品更新，支持实例化
-  // nameSrv: '112.124.141.191:80',
+  nameSrv: 'onsaddr.mq-internet-access.mq-internet.aliyuncs.com:80',
   onsAddr: 'http://onsaddr-internet.aliyun.com/rocketmq/nsaddr4client-internet',
 };
diff --git a/lib/client_config.js b/lib/client_config.js
index bff3e73..73ff67d 100644
--- a/lib/client_config.js
+++ b/lib/client_config.js
@@ -2,6 +2,7 @@
 
 const Base = require('sdk-base');
 const address = require('address');
+const MixAll = require('./mix_all');
 
 const defaultOptions = {
   instanceName: 'DEFAULT',
@@ -67,6 +68,14 @@ class ClientConfig extends Base {
     return this.options.namespace;
   }
 
+  formatTopic(topic) {
+    if (this.namespace && (!topic.startsWith(this.namespace) &&
+        !topic.startsWith(MixAll.RETRY_GROUP_TOPIC_PREFIX))) {
+      topic = `${this.namespace}%${topic}`;
+    }
+    return topic;
+  }
+
   /**
    * 将实例名修改为进程号
    */
diff --git a/lib/consumer/mq_push_consumer.js b/lib/consumer/mq_push_consumer.js
index 540126c..21676a4 100644
--- a/lib/consumer/mq_push_consumer.js
+++ b/lib/consumer/mq_push_consumer.js
@@ -184,9 +184,7 @@ class MQPushConsumer extends ClientConfig {
    */
   subscribe(topic, subExpression, handler) {
     // 添加 namespace 前缀
-    if (this.namespace && !topic.startsWith(this.namespace)) {
-      topic = `${this.namespace}%${topic}`;
-    }
+    topic = this.formatTopic(topic);
 
     if (arguments.length === 2) {
       handler = subExpression;
diff --git a/lib/producer/mq_producer.js b/lib/producer/mq_producer.js
index f89d4bd..b8c9558 100644
--- a/lib/producer/mq_producer.js
+++ b/lib/producer/mq_producer.js
@@ -193,9 +193,7 @@ class MQProducer extends ClientConfig {
       throw new Error(`no publish router data for topic: ${msg.topic}`);
     }
 
-    if (this.namespace && (!msg.topic.startsWith(this.namespace) || !msg.topic.startsWith(MixAll.RETRY_GROUP_TOPIC_PREFIX))) {
-      msg.topic = `${this.namespace}%${msg.topic}`;
-    }
+    msg.topic = this.formatTopic(msg.topic);
 
     const maxTimeout = this.options.sendMsgTimeout + 1000;
     const timesTotal = 1 + this.options.retryTimesWhenSendFailed;
diff --git a/test/index.test.js b/test/index.test.js
index 5780484..0ea0349 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -212,6 +212,18 @@ describe('test/index.test.js', () => {
       });
       assert(offset === -1);
     });
+
+    it('should support namespace', () => {
+      mm(producer, 'namespace', 'xxx');
+      mm(consumer, 'namespace', 'xxx');
+
+      assert(consumer.consumerGroup === `xxx%${config.consumerGroup}`);
+      assert(producer.producerGroup === `xxx%${config.producerGroup}`);
+
+      assert(consumer.formatTopic(`%RETRY%${consumer.consumerGroup}`) === `%RETRY%${consumer.consumerGroup}`);
+      assert(producer.formatTopic('TEST_TOPIC') === 'xxx%TEST_TOPIC');
+      assert(consumer.formatTopic('TEST_TOPIC') === 'xxx%TEST_TOPIC');
+    });
   });
 
   // 广播消费
@@ -593,7 +605,7 @@ describe('test/index.test.js', () => {
     let consumer;
     let consumeTime = 0;
     // 允许的误差时间
-    const deviationTime = 3000;
+    const deviationTime = 4000;
 
     before(async () => {
       producer = new Producer(Object.assign({