diff --git a/dubbo-config/src/main/java/com/alibaba/dubbo/config/AbstractConfig.java b/dubbo-config/src/main/java/com/alibaba/dubbo/config/AbstractConfig.java
index 6e292cfa559242b49411117c5642f4a6ba6177fc..ba9e06c1c309c739c13031043962fde04a4e5222 100644
--- a/dubbo-config/src/main/java/com/alibaba/dubbo/config/AbstractConfig.java
+++ b/dubbo-config/src/main/java/com/alibaba/dubbo/config/AbstractConfig.java
@@ -124,18 +124,18 @@ public abstract class AbstractConfig implements Serializable {
                     } else {
                         String str = String.valueOf(value).trim();
                         if (value != null && str.length() > 0) {
-                            if (prefix != null && prefix.length() > 0) {
-                                key = prefix + "." + key;
-                            }
                             if (parameter != null && parameter.escaped()) {
                                 str = URL.encode(str);
                             }
                             if (parameter != null && parameter.append()) {
-                                String pre = (String)parameters.get(key);
+                                String pre = (String)parameters.get(Constants.DEFAULT_KEY + "." + key);
                                 if (pre != null && pre.length() > 0) {
                                     str = pre + "," + str;
                                 }
                             }
+                            if (prefix != null && prefix.length() > 0) {
+                                key = prefix + "." + key;
+                            }
                             parameters.put(key, str);
                         } else if (parameter != null && parameter.required()) {
                             throw new IllegalStateException(config.getClass().getSimpleName() + "." + key + " == null");
diff --git a/dubbo-config/src/main/java/com/alibaba/dubbo/config/ReferenceConfig.java b/dubbo-config/src/main/java/com/alibaba/dubbo/config/ReferenceConfig.java
index 55925b98f134cd69849c36eb87a30176cf0447ec..5c896dd1f88e8d7ac0c868f4ecdab4c0de0cfa0f 100644
--- a/dubbo-config/src/main/java/com/alibaba/dubbo/config/ReferenceConfig.java
+++ b/dubbo-config/src/main/java/com/alibaba/dubbo/config/ReferenceConfig.java
@@ -93,7 +93,13 @@ public class ReferenceConfig<T> extends AbstractConsumerConfig {
     private transient boolean    initialized;
 
     private transient boolean    destroyed;
+
+    private final List<URL> urls = new ArrayList<URL>();
     
+    public List<URL> toUrls() {
+        return urls;
+    }
+
     public synchronized T get() {
         if (destroyed){
             throw new IllegalStateException("Already destroyed!");
@@ -106,7 +112,7 @@ public class ReferenceConfig<T> extends AbstractConsumerConfig {
     
     public synchronized void destroy() {
         if (ref == null) {
-            throw new IllegalStateException("Uninitialized.");
+            return;
         }
         if (destroyed){
             return;
@@ -276,7 +282,6 @@ public class ReferenceConfig<T> extends AbstractConsumerConfig {
                 logger.info("Using injvm service " + interfaceClass.getName());
             }
         } else {
-            List<URL> urls = new ArrayList<URL>();
             if (url != null && url.length() > 0) { // 用户指定URL，指定的URL可能是对点对直连地址，也可能是注册中心URL
                 String[] us = Constants.SEMICOLON_SPLIT_PATTERN.split(url);
                 if (us != null && us.length > 0) {
diff --git a/dubbo-config/src/main/java/com/alibaba/dubbo/config/ServiceConfig.java b/dubbo-config/src/main/java/com/alibaba/dubbo/config/ServiceConfig.java
index 8c1c11e7475a5e240266e01cc11c3070e489aca5..485c5097b8b68d4c95d9e6b1f409ef824d737d98 100644
--- a/dubbo-config/src/main/java/com/alibaba/dubbo/config/ServiceConfig.java
+++ b/dubbo-config/src/main/java/com/alibaba/dubbo/config/ServiceConfig.java
@@ -85,11 +85,10 @@ public class ServiceConfig<T> extends AbstractServiceConfig {
     
     private transient boolean generic;
     
-    @Parameter(excluded = true)
-    public boolean isExported() {
-        return exported;
+    public List<URL> toUrls() {
+        return urls;
     }
-    
+
     public synchronized void export() {
         if (delay != null && delay > 0) {
             Thread thread = new Thread(new Runnable() {
@@ -251,8 +250,8 @@ public class ServiceConfig<T> extends AbstractServiceConfig {
     }
 
     public synchronized void unexport() {
-        if (!exported) {
-            throw new IllegalStateException("No exported!");
+        if (! exported) {
+            return;
         }
         if (unexported) {
             return;
@@ -328,7 +327,7 @@ public class ServiceConfig<T> extends AbstractServiceConfig {
             }
             map.put("dubbo", Version.getVersion());
             appendParameters(map, application);
-            appendParameters(map, provider);
+            appendParameters(map, provider, Constants.DEFAULT_KEY);
             appendParameters(map, protocolConfig);
             appendParameters(map, this);
             map.put("prompt", "dubbo");
diff --git a/dubbo-config/src/test/java/com/alibaba/dubbo/config/ConfigTest.java b/dubbo-config/src/test/java/com/alibaba/dubbo/config/ConfigTest.java
index 0d7e285a1146436fb2b8f77c42b7c1ecae3d9013..768936ca9750ca3e94e31a9fd95082ff154a153b 100644
--- a/dubbo-config/src/test/java/com/alibaba/dubbo/config/ConfigTest.java
+++ b/dubbo-config/src/test/java/com/alibaba/dubbo/config/ConfigTest.java
@@ -26,6 +26,7 @@ import org.springframework.context.support.ClassPathXmlApplicationContext;
 import com.alibaba.dubbo.common.URL;
 import com.alibaba.dubbo.common.utils.NetUtils;
 import com.alibaba.dubbo.config.api.DemoService;
+import com.alibaba.dubbo.config.provider.impl.DemoServiceImpl;
 import com.alibaba.dubbo.registry.RegistryService;
 import com.alibaba.dubbo.registry.support.SimpleRegistryExporter;
 import com.alibaba.dubbo.registry.support.SimpleRegistryService;
@@ -174,5 +175,46 @@ public class ConfigTest {
         consumer.setTimeout(2000);
         Assert.assertEquals("1000", System.getProperty("sun.rmi.transport.tcp.responseTimeout"));
     }
+    
+    @Test
+    public void testAppendFilter() throws Exception {
+        ProviderConfig provider = new ProviderConfig();
+        provider.setFilter("classloader,monitor");
+        ServiceConfig<DemoService> service = new ServiceConfig<DemoService>();
+        service.setFilter("accesslog,trace");
+        service.setProvider(provider);
+        service.setApplication(new ApplicationConfig("provider"));
+        service.setRegistry(new RegistryConfig(RegistryConfig.NO_AVAILABLE));
+        service.setInterface(DemoService.class);
+        service.setRef(new DemoServiceImpl());
+        try {
+            service.export();
+            List<URL> urls = service.toUrls();
+            Assert.assertNotNull(urls);
+            Assert.assertEquals(1, urls.size());
+            Assert.assertEquals("classloader,monitor,accesslog,trace", urls.get(0).getParameter("service.filter"));
+            
+            ConsumerConfig consumer = new ConsumerConfig();
+            consumer.setFilter("classloader,monitor");
+            ReferenceConfig<DemoService> reference = new ReferenceConfig<DemoService>();
+            reference.setFilter("accesslog,trace");
+            reference.setConsumer(consumer);
+            reference.setApplication(new ApplicationConfig("consumer"));
+            reference.setRegistry(new RegistryConfig(RegistryConfig.NO_AVAILABLE));
+            reference.setInterface(DemoService.class);
+            reference.setUrl("dubbo://" + NetUtils.getLocalHost() + ":20880?" + DemoService.class.getName() + "?check=false");
+            try {
+                reference.get();
+                urls = reference.toUrls();
+                Assert.assertNotNull(urls);
+                Assert.assertEquals(1, urls.size());
+                Assert.assertEquals("classloader,monitor,accesslog,trace", urls.get(0).getParameter("reference.filter"));
+            } finally {
+                reference.destroy();
+            }
+        } finally {
+            service.unexport();
+        }
+    }
 
 }
\ No newline at end of file