diff --git a/extension-impl/registry-nacos/src/main/java/com/alipay/sofa/rpc/registry/nacos/NacosRegistry.java b/extension-impl/registry-nacos/src/main/java/com/alipay/sofa/rpc/registry/nacos/NacosRegistry.java
index 93379c3f4..19577d41c 100644
--- a/extension-impl/registry-nacos/src/main/java/com/alipay/sofa/rpc/registry/nacos/NacosRegistry.java
+++ b/extension-impl/registry-nacos/src/main/java/com/alipay/sofa/rpc/registry/nacos/NacosRegistry.java
@@ -54,7 +54,7 @@
  * <p>Simple Nacos registry. Features: <br/>
  * 1. register publisher as instance to nacos server.
  * 2. subscribe instances change event
- * 
+ *
  * <pre>
  *     Structure of nacos storage:
  *     --sofa-rpc (namespace)
@@ -66,9 +66,9 @@
  *        |--com.alipay.sofa.rpc.example.EchoService (next serviceName)
  *        |......
  * </pre>
- * 
+ *
  * </p>
- * 
+ *
  * @author <a href=mailto:jervyshi@gmail.com>JervyShi</a>
  */
 @Extension("nacos")
@@ -92,6 +92,8 @@ public class NacosRegistry extends Registry {
 
     private ConcurrentMap<ConsumerConfig, EventListener>  consumerListeners = new ConcurrentHashMap<ConsumerConfig, EventListener>();
 
+    private Properties                                    nacosConfig       = new Properties();
+
     /**
      * Instantiates a new Nacos registry.
      *
@@ -116,7 +118,11 @@ public synchronized void init() {
         String address; // IP地址
         if (idx > 0) {
             address = addressInput.substring(0, idx);
-            namespace = addressInput.substring(idx);
+            namespace = addressInput.substring(idx + 1);
+            //for host:port/ this scene
+            if (StringUtils.isBlank(namespace)) {
+                namespace = DEFAULT_NAMESPACE;
+            }
         } else {
             address = addressInput;
             namespace = DEFAULT_NAMESPACE;
@@ -124,7 +130,6 @@ public synchronized void init() {
 
         defaultCluster = Collections.singletonList(NacosRegistryHelper.DEFAULT_CLUSTER);
 
-        Properties nacosConfig = new Properties();
         nacosConfig.put(PropertyKeyConst.SERVER_ADDR, address);
         nacosConfig.put(PropertyKeyConst.NAMESPACE, namespace);
 
@@ -329,4 +334,8 @@ public void destroy() {
         namingService = null;
         providerObserver = null;
     }
+
+    public Properties getNacosConfig() {
+        return nacosConfig;
+    }
 }
diff --git a/extension-impl/registry-nacos/src/test/java/com/alipay/sofa/rpc/registry/nacos/NacosRegistryNamespaceTest.java b/extension-impl/registry-nacos/src/test/java/com/alipay/sofa/rpc/registry/nacos/NacosRegistryNamespaceTest.java
new file mode 100644
index 000000000..412fcce44
--- /dev/null
+++ b/extension-impl/registry-nacos/src/test/java/com/alipay/sofa/rpc/registry/nacos/NacosRegistryNamespaceTest.java
@@ -0,0 +1,96 @@
+/*
+ * 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 com.alipay.sofa.rpc.registry.nacos;
+
+import com.alibaba.nacos.api.PropertyKeyConst;
+import com.alipay.sofa.rpc.config.RegistryConfig;
+import com.alipay.sofa.rpc.registry.RegistryFactory;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Properties;
+
+/**
+ * @author bystander
+ * @version $Id: NacosRegistryNamespaceTest.java, v 0.1 2019年02月20日 18:30 bystander Exp $
+ */
+public class NacosRegistryNamespaceTest {
+
+    @Test
+    public void testWithNamespace() {
+        RegistryConfig registryConfig = new RegistryConfig()
+            .setProtocol("nacos")
+            .setSubscribe(true)
+            .setAddress("127.0.0.1:8848/namespace")
+            .setRegister(true);
+
+        NacosRegistry registry = (NacosRegistry) RegistryFactory.getRegistry(registryConfig);
+        registry.init();
+
+        Properties properties = registry.getNacosConfig();
+
+        String address = properties.getProperty(PropertyKeyConst.SERVER_ADDR);
+
+        Assert.assertEquals("127.0.0.1:8848", address);
+        String namespace = properties.getProperty(PropertyKeyConst.NAMESPACE);
+        Assert.assertEquals("namespace", namespace);
+
+    }
+
+    @Test
+    public void testWithoutNamespace() {
+        RegistryConfig registryConfig = new RegistryConfig()
+            .setProtocol("nacos")
+            .setSubscribe(true)
+            .setAddress("127.0.0.1:8848/")
+            .setRegister(true);
+
+        NacosRegistry registry = (NacosRegistry) RegistryFactory.getRegistry(registryConfig);
+        registry.init();
+
+        Properties properties = registry.getNacosConfig();
+
+        String address = properties.getProperty(PropertyKeyConst.SERVER_ADDR);
+
+        Assert.assertEquals("127.0.0.1:8848", address);
+        String namespace = properties.getProperty(PropertyKeyConst.NAMESPACE);
+        Assert.assertEquals("sofa-rpc", namespace);
+
+    }
+
+    @Test
+    public void testWithoutSlashNamespace() {
+        RegistryConfig registryConfig = new RegistryConfig()
+            .setProtocol("nacos")
+            .setSubscribe(true)
+            .setAddress("127.0.0.1:8848")
+            .setRegister(true);
+
+        NacosRegistry registry = (NacosRegistry) RegistryFactory.getRegistry(registryConfig);
+        registry.init();
+
+        Properties properties = registry.getNacosConfig();
+
+        String address = properties.getProperty(PropertyKeyConst.SERVER_ADDR);
+
+        Assert.assertEquals("127.0.0.1:8848", address);
+        String namespace = properties.getProperty(PropertyKeyConst.NAMESPACE);
+        //default namespace
+        Assert.assertEquals("sofa-rpc", namespace);
+
+    }
+}
\ No newline at end of file