diff --git a/dubbo-rpc/src/main/java/com/alibaba/dubbo/rpc/proxy/AbstractProxyFactory.java b/dubbo-rpc/src/main/java/com/alibaba/dubbo/rpc/proxy/AbstractProxyFactory.java
index abdc5ac6aa..b62c204013 100644
--- a/dubbo-rpc/src/main/java/com/alibaba/dubbo/rpc/proxy/AbstractProxyFactory.java
+++ b/dubbo-rpc/src/main/java/com/alibaba/dubbo/rpc/proxy/AbstractProxyFactory.java
@@ -30,16 +30,20 @@ import com.alibaba.dubbo.rpc.service.EchoService;
 public abstract class AbstractProxyFactory implements ProxyFactory {
 
     public <T> T getProxy(Invoker<T> invoker) throws RpcException {
-        Class<?>[] interfaces;
-        String[] types = Constants.COMMA_SPLIT_PATTERN.split(invoker.getUrl().getParameter("interfaces", ""));
-        if (types != null && types.length > 0) {
-            interfaces = new Class<?>[types.length + 2];
-            interfaces[0] = invoker.getInterface();
-            interfaces[1] = EchoService.class;
-            for (int i = 0; i < types.length; i ++) {
-                interfaces[i + 1] = ReflectUtils.forName(types[i]);
+        Class<?>[] interfaces = null;
+        String config = invoker.getUrl().getParameter("interfaces");
+        if (config != null && config.length() > 0) {
+            String[] types = Constants.COMMA_SPLIT_PATTERN.split(config);
+            if (types != null && types.length > 0) {
+                interfaces = new Class<?>[types.length + 2];
+                interfaces[0] = invoker.getInterface();
+                interfaces[1] = EchoService.class;
+                for (int i = 0; i < types.length; i ++) {
+                    interfaces[i + 1] = ReflectUtils.forName(types[i]);
+                }
             }
-        } else {
+        }
+        if (interfaces == null) {
             interfaces = new Class<?>[] {invoker.getInterface(), EchoService.class};
         }
         return getProxy(invoker, interfaces);