diff --git a/apollo-biz/src/main/java/com/ctrip/apollo/biz/service/AppNamespaceService.java b/apollo-biz/src/main/java/com/ctrip/apollo/biz/service/AppNamespaceService.java
index 86681f6e5973a6f913b48e7303eebd4d57636f26..be62ab8435e48b67927b1fb90ab55f055ecd6051 100644
--- a/apollo-biz/src/main/java/com/ctrip/apollo/biz/service/AppNamespaceService.java
+++ b/apollo-biz/src/main/java/com/ctrip/apollo/biz/service/AppNamespaceService.java
@@ -9,6 +9,7 @@ import org.springframework.transaction.annotation.Transactional;
 import com.ctrip.apollo.biz.entity.AppNamespace;
 import com.ctrip.apollo.biz.entity.Audit;
 import com.ctrip.apollo.biz.repository.AppNamespaceRepository;
+import com.ctrip.apollo.core.ConfigConsts;
 import com.ctrip.apollo.core.exception.ServiceException;
 
 @Service
@@ -33,7 +34,7 @@ public class AppNamespaceService {
     }
     AppNamespace appNs = new AppNamespace();
     appNs.setAppId(appId);
-    appNs.setName(appId);
+    appNs.setName(ConfigConsts.NAMESPACE_DEFAULT);
     appNs.setComment("default app namespace");
     appNs.setDataChangeCreatedBy(createBy);
     appNs.setDataChangeLastModifiedBy(createBy);
diff --git a/apollo-biz/src/main/java/com/ctrip/apollo/biz/service/NamespaceService.java b/apollo-biz/src/main/java/com/ctrip/apollo/biz/service/NamespaceService.java
index 93433c5b52a79004e4d9bfd6e69ade6886575701..46086d18371647655ba1099850d91680da3ea098 100644
--- a/apollo-biz/src/main/java/com/ctrip/apollo/biz/service/NamespaceService.java
+++ b/apollo-biz/src/main/java/com/ctrip/apollo/biz/service/NamespaceService.java
@@ -91,7 +91,7 @@ public class NamespaceService {
     Namespace ns = new Namespace();
     ns.setAppId(appId);
     ns.setClusterName(ConfigConsts.CLUSTER_NAME_DEFAULT);
-    ns.setNamespaceName(appId);
+    ns.setNamespaceName(ConfigConsts.NAMESPACE_DEFAULT);
     ns.setDataChangeCreatedBy(createBy);
     ns.setDataChangeLastModifiedBy(createBy);
     namespaceRepository.save(ns);
diff --git a/apollo-biz/src/test/java/com/ctrip/apollo/biz/service/AdminServiceTest.java b/apollo-biz/src/test/java/com/ctrip/apollo/biz/service/AdminServiceTest.java
index bff5ae75d2805d9aeabc7a37211f597384050372..01e409206b4529db7a17db47bdd488d129049895 100644
--- a/apollo-biz/src/test/java/com/ctrip/apollo/biz/service/AdminServiceTest.java
+++ b/apollo-biz/src/test/java/com/ctrip/apollo/biz/service/AdminServiceTest.java
@@ -64,7 +64,7 @@ public class AdminServiceTest {
 
     List<Namespace> namespaces = namespaceService.findNamespaces(appId, clusters.get(0).getName());
     Assert.assertEquals(1, namespaces.size());
-    Assert.assertEquals(appId, namespaces.get(0).getNamespaceName());
+    Assert.assertEquals(ConfigConsts.NAMESPACE_DEFAULT, namespaces.get(0).getNamespaceName());
 
     List<Audit> audits = auditService.findByOwner(owner);
     Assert.assertEquals(4, audits.size());
diff --git a/apollo-portal/src/main/java/com/ctrip/apollo/portal/service/ServiceLocator.java b/apollo-portal/src/main/java/com/ctrip/apollo/portal/service/ServiceLocator.java
index 192f134d4f936d556eed0fd295ea2e3e23d128a4..629f172f6d917214f0b2d00e9c288620459d512d 100644
--- a/apollo-portal/src/main/java/com/ctrip/apollo/portal/service/ServiceLocator.java
+++ b/apollo-portal/src/main/java/com/ctrip/apollo/portal/service/ServiceLocator.java
@@ -41,18 +41,18 @@ public class ServiceLocator {
 
   public ServiceDTO getAdminService(Env env) throws ServiceException {
     List<ServiceDTO> services = getServices(env, "admin");
-    if (services.size() == 0) {
+    if (services == null || services.size() == 0) {
       throw new ServiceException("No available admin service");
     }
-    return services.get(adminCallCounts.getAndIncrement() % services.size());
+    return services.get(Math.abs(adminCallCounts.getAndIncrement()) % services.size());
   }
 
   public ServiceDTO getConfigService(Env env) throws ServiceException {
     List<ServiceDTO> services = getServices(env, "config");
-    if (services.size() == 0) {
+    if (services == null || services.size() == 0) {
       throw new ServiceException("No available config service");
     }
-    return services.get(configCallCounts.getAndIncrement() % services.size());
+    return services.get(Math.abs(configCallCounts.getAndIncrement()) % services.size());
   }
 
   private List<ServiceDTO> getServices(Env env, String serviceUrl) {