diff --git a/apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/ItemSetService.java b/apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/ItemSetService.java
index bcfa220ecd3ca37b396d9b26069213e8aa011565..0590e02ed3dfed703631db39122b024c9313c8c3 100644
--- a/apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/ItemSetService.java
+++ b/apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/ItemSetService.java
@@ -13,6 +13,7 @@ import com.ctrip.framework.apollo.biz.utils.ConfigChangeContentBuilder;
 import com.ctrip.framework.apollo.common.utils.BeanUtils;
 import com.ctrip.framework.apollo.core.dto.ItemChangeSets;
 import com.ctrip.framework.apollo.core.dto.ItemDTO;
+import com.ctrip.framework.apollo.core.utils.StringUtils;
 
 
 @Service
@@ -71,7 +72,11 @@ public class ItemSetService {
       auditService.audit("ItemSet", null, Audit.OP.DELETE, operator);
     }
 
-    createCommit(appId, clusterName, namespaceName, configChangeContentBuilder.build(), changeSet.getDataChangeLastModifiedBy());
+    String configChangeContent = configChangeContentBuilder.build();
+    if (!StringUtils.isEmpty(configChangeContent)){
+      createCommit(appId, clusterName, namespaceName, configChangeContentBuilder.build(), changeSet.getDataChangeLastModifiedBy());
+    }
+
     return changeSet;
 
   }
diff --git a/apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/entity/vo/ItemDiffs.java b/apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/entity/vo/ItemDiffs.java
index 6d19e7e078ef0c97e21d67cd32c59c4261159627..6a3656352698d3ff18d2bbb37469c0bb15e4320a 100644
--- a/apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/entity/vo/ItemDiffs.java
+++ b/apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/entity/vo/ItemDiffs.java
@@ -5,6 +5,7 @@ import com.ctrip.framework.apollo.core.dto.ItemChangeSets;
 public class ItemDiffs {
   private NamespaceIdentifer namespace;
   private ItemChangeSets diffs;
+  private String extInfo;
 
   public ItemDiffs(NamespaceIdentifer namespace){
     this.namespace = namespace;
@@ -24,4 +25,12 @@ public class ItemDiffs {
   public void setDiffs(ItemChangeSets diffs) {
     this.diffs = diffs;
   }
+
+  public String getExtInfo() {
+    return extInfo;
+  }
+
+  public void setExtInfo(String extInfo) {
+    this.extInfo = extInfo;
+  }
 }
diff --git a/apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/service/ConfigService.java b/apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/service/ConfigService.java
index e9fd2a9d35a6faeba429c6f1d52572b87e11fce6..4b7c3c9cd65d136657fd56f43c4bf8f8f56bc90c 100644
--- a/apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/service/ConfigService.java
+++ b/apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/service/ConfigService.java
@@ -4,6 +4,7 @@ package com.ctrip.framework.apollo.portal.service;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
 import org.springframework.util.CollectionUtils;
 import org.springframework.web.client.HttpClientErrorException;
@@ -135,7 +136,12 @@ public class ConfigService {
     for (NamespaceIdentifer namespace : comparedNamespaces) {
 
       ItemDiffs itemDiffs = new ItemDiffs(namespace);
-      itemDiffs.setDiffs(parseChangeSets(namespace, sourceItems));
+      try {
+        itemDiffs.setDiffs(parseChangeSets(namespace, sourceItems));
+      } catch (BadRequestException e) {
+        itemDiffs.setDiffs(new ItemChangeSets());
+        itemDiffs.setExtInfo("该集群下没有名为#" + namespace.getNamespaceName() + "#的namespace");
+      }
       result.add(itemDiffs);
     }
 
@@ -150,12 +156,12 @@ public class ConfigService {
     NamespaceDTO namespaceDTO = null;
     try {
       namespaceDTO = namespaceAPI.loadNamespace(appId, env, clusterName, namespaceName);
-    } catch (NotFoundException e) {
-      logger.warn("namespace not exist. appId:{}, env:{}, clusterName:{}, namespaceName:{}", appId, env, clusterName,
-                  namespaceName);
-      throw new BadRequestException(String.format(
-          "namespace not exist. appId:%s, env:%s, clusterName:%s, namespaceName:%s", appId, env, clusterName,
-          namespaceName));
+    } catch (HttpClientErrorException e) {
+      if (e.getStatusCode() == HttpStatus.NOT_FOUND) {
+        throw new BadRequestException(String.format(
+            "namespace not exist. appId:%s, env:%s, clusterName:%s, namespaceName:%s", appId, env, clusterName,
+            namespaceName));
+      }
     }
     return namespaceDTO.getId();
   }
diff --git a/apollo-portal/src/main/resources/static/config/sync.html b/apollo-portal/src/main/resources/static/config/sync.html
index 033f0936f13e9dc424d397e8a122853a81e12e12..1f86ec11859e1e7def171c88ae33d0f9c38e577c 100644
--- a/apollo-portal/src/main/resources/static/config/sync.html
+++ b/apollo-portal/src/main/resources/static/config/sync.html
@@ -42,12 +42,22 @@
         </header>
         <div class="panel-body">
             <div class="row" ng-show="syncItemStep == 1">
+                <div class="form-horizontal">
+                    <div class="form-group">
+                        <label class="col-sm-2 control-label">同步的Namespace</label>
+                        <div class="col-sm-6">
+                            <h4 ng-bind="pageContext.namespaceName"></h4>
+                        </div>
+                    </div>
+                </div>
                 <div class="form-horizontal">
                     <div class="form-group">
                         <label class="col-sm-2 control-label">同步到那个集群</label>
                         <div class="col-sm-6">
                             <apolloclusterselector apollo-app-id="pageContext.appId" apollo-default-all-checked="true"
-                                                   apollo-select="collectSelectedClusters"></apolloclusterselector>
+                                                   apollo-select="collectSelectedClusters"
+                                                   apollo-not-checked-env="pageContext.env"
+                                                   apollo-not-checked-cluster="pageContext.clusterName"></apolloclusterselector>
                         </div>
                     </div>
                 </div>
@@ -96,9 +106,12 @@
 
             <!--step 2-->
             <div class="row" ng-show="syncItemStep == 2" ng-repeat="diff in diffs">
-                <h4 class="text-center">环境:<span ng-bind="diff.namespace.env"></span>
+                <h4 class="text-center">
+                    环境:<span ng-bind="diff.namespace.env"></span>
                     集群:<span ng-bind="diff.namespace.clusterName"></span>
-                    <em ng-show="diff.diffs.createItems.length == 0 && diff.diffs.updateItems.length == 0">没有更新的配置</em>
+                    <span ng-show="!diff.extInfo">Namespace:{{pageContext.namespaceName}}</span>
+                    <label ng-show="diff.diffs.createItems.length + diff.diffs.updateItems.length == 0">没有更新的配置</label>
+                    <label ng-show="diff.extInfo" ng-bind="diff.extInfo"></label>
                 </h4>
                 <hr>
 
@@ -180,7 +193,6 @@
 <script src="../vendor/angular/loading-bar.min.js"></script>
 
 
-
 <!-- bootstrap.js -->
 <script src="../vendor/bootstrap/js/bootstrap.min.js" type="text/javascript"></script>
 
diff --git a/apollo-portal/src/main/resources/static/scripts/directive.js b/apollo-portal/src/main/resources/static/scripts/directive.js
index a8aed71b91f4c2b9f9548685c22dea90810408d7..6e98407b850f1c0fd2aef47a0148597558e39abf 100644
--- a/apollo-portal/src/main/resources/static/scripts/directive.js
+++ b/apollo-portal/src/main/resources/static/scripts/directive.js
@@ -128,7 +128,9 @@ directive_module.directive('apolloclusterselector', function ($compile, $window,
             defaultAllChecked: '=apolloDefaultAllChecked',
             select: '=apolloSelect',
             defaultCheckedEnv: '=apolloDefaultCheckedEnv',
-            defaultCheckedCluster: '=apolloDefaultCheckedCluster'
+            defaultCheckedCluster: '=apolloDefaultCheckedCluster',
+            notCheckedEnv:'=apolloNotCheckedEnv',
+            notCheckedCluster: '=apolloNotCheckedCluster'
         },
         link: function (scope, element, attrs) {
             
@@ -146,9 +148,15 @@ directive_module.directive('apolloclusterselector', function ($compile, $window,
                         var env = node.env;
                         node.clusters.forEach(function (cluster) {
                             cluster.env = env;
+                            //default checked
                             cluster.checked = scope.defaultAllChecked ||
                                               (cluster.env == scope.defaultCheckedEnv && cluster.name
                                                                                          == scope.defaultCheckedCluster);
+                            //not checked
+                            if (cluster.env == scope.notCheckedEnv && cluster.name == scope.notCheckedCluster){
+                                cluster.checked = false;
+                            }
+
                             scope.clusters.push(cluster);
                         })
                     });