diff --git a/naming/src/main/java/com/alibaba/nacos/naming/core/CatalogServiceV2Impl.java b/naming/src/main/java/com/alibaba/nacos/naming/core/CatalogServiceV2Impl.java
index f7455f88f..ab23f391b 100644
--- a/naming/src/main/java/com/alibaba/nacos/naming/core/CatalogServiceV2Impl.java
+++ b/naming/src/main/java/com/alibaba/nacos/naming/core/CatalogServiceV2Impl.java
@@ -171,14 +171,14 @@ public class CatalogServiceV2Impl implements CatalogService {
     private Collection<Service> patternServices(String namespaceId, String group, String serviceName) {
         boolean noFilter = StringUtils.isBlank(serviceName) && StringUtils.isBlank(group);
         if (noFilter) {
-            return serviceStorage.getAllServicesOfNamespace(namespaceId);
+            return ServiceManager.getInstance().getSingletons(namespaceId);
         }
         Collection<Service> result = new LinkedList<>();
         StringJoiner regex = new StringJoiner(Constants.SERVICE_INFO_SPLITER);
         regex.add(getRegexString(group));
         regex.add(getRegexString(serviceName));
         String regexString = regex.toString();
-        for (Service each : serviceStorage.getAllServicesOfNamespace(namespaceId)) {
+        for (Service each : ServiceManager.getInstance().getSingletons(namespaceId)) {
             if (each.getGroupedServiceName().matches(regexString)) {
                 result.add(each);
             }
diff --git a/naming/src/main/java/com/alibaba/nacos/naming/core/v2/ServiceManager.java b/naming/src/main/java/com/alibaba/nacos/naming/core/v2/ServiceManager.java
index 5c62caf26..84ac7355e 100644
--- a/naming/src/main/java/com/alibaba/nacos/naming/core/v2/ServiceManager.java
+++ b/naming/src/main/java/com/alibaba/nacos/naming/core/v2/ServiceManager.java
@@ -16,8 +16,12 @@
 
 package com.alibaba.nacos.naming.core.v2;
 
+import com.alibaba.nacos.common.utils.ConcurrentHashSet;
 import com.alibaba.nacos.naming.core.v2.pojo.Service;
 
+import java.util.HashSet;
+import java.util.Optional;
+import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 
 /**
@@ -31,23 +35,57 @@ public class ServiceManager {
     
     private final ConcurrentHashMap<Service, Service> singletonRepository;
     
+    private final ConcurrentHashMap<String, Set<Service>> namespaceSingletonMaps;
+    
     private ServiceManager() {
         singletonRepository = new ConcurrentHashMap<>(1 << 10);
+        namespaceSingletonMaps = new ConcurrentHashMap<>(1 << 2);
     }
     
     public static ServiceManager getInstance() {
         return INSTANCE;
     }
     
+    public Set<Service> getSingletons(String namespace) {
+        return namespaceSingletonMaps.getOrDefault(namespace, new HashSet<>(1));
+    }
+    
     /**
-     * Get singleton service.
+     * Get singleton service. Put to manager if no singleton.
      *
      * @param service new service
      * @return if service is exist, return exist service, otherwise return new service
      */
     public Service getSingleton(Service service) {
-        Service previous = singletonRepository.putIfAbsent(service, service);
-        return (null == previous) ? service : previous;
+        singletonRepository.putIfAbsent(service, service);
+        Service result = singletonRepository.get(service);
+        if (!namespaceSingletonMaps.containsKey(result.getNamespace())) {
+            namespaceSingletonMaps.putIfAbsent(result.getNamespace(), new ConcurrentHashSet<>());
+            namespaceSingletonMaps.get(result.getNamespace()).add(result);
+        }
+        return result;
+    }
+    
+    /**
+     * Get singleton service if Exist.
+     *
+     * @param namespace namespace of service
+     * @param group     group of service
+     * @param name      name of service
+     * @return singleton service if exist, otherwise null optional
+     */
+    public Optional<Service> getSingletonIfExist(String namespace, String group, String name) {
+        return getSingletonIfExist(Service.newService(namespace, group, name));
+    }
+    
+    /**
+     * Get singleton service if Exist.
+     *
+     * @param service service template
+     * @return singleton service if exist, otherwise null optional
+     */
+    public Optional<Service> getSingletonIfExist(Service service) {
+        return Optional.ofNullable(singletonRepository.get(service));
     }
     
     /**
diff --git a/naming/src/main/java/com/alibaba/nacos/naming/core/v2/index/ServiceStorage.java b/naming/src/main/java/com/alibaba/nacos/naming/core/v2/index/ServiceStorage.java
index 627ca1ad6..41e2a8dad 100644
--- a/naming/src/main/java/com/alibaba/nacos/naming/core/v2/index/ServiceStorage.java
+++ b/naming/src/main/java/com/alibaba/nacos/naming/core/v2/index/ServiceStorage.java
@@ -20,7 +20,6 @@ import com.alibaba.nacos.api.naming.CommonParams;
 import com.alibaba.nacos.api.naming.pojo.Instance;
 import com.alibaba.nacos.api.naming.pojo.ServiceInfo;
 import com.alibaba.nacos.api.naming.utils.NamingUtils;
-import com.alibaba.nacos.common.utils.ConcurrentHashSet;
 import com.alibaba.nacos.naming.core.v2.ServiceManager;
 import com.alibaba.nacos.naming.core.v2.client.Client;
 import com.alibaba.nacos.naming.core.v2.client.manager.ClientManager;
@@ -32,7 +31,6 @@ import com.alibaba.nacos.naming.core.v2.pojo.Service;
 import com.alibaba.nacos.naming.misc.SwitchDomain;
 import org.springframework.stereotype.Component;
 
-import java.util.Collection;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedList;
@@ -63,8 +61,6 @@ public class ServiceStorage {
     
     private final ConcurrentMap<Service, Set<String>> serviceClusterIndex;
     
-    private final ConcurrentMap<String, Set<Service>> namespaceServiceIndex;
-    
     public ServiceStorage(ClientServiceIndexesManager serviceIndexesManager, ClientManagerDelegate clientManager,
             SwitchDomain switchDomain, NamingMetadataManager metadataManager) {
         this.serviceIndexesManager = serviceIndexesManager;
@@ -73,17 +69,12 @@ public class ServiceStorage {
         this.metadataManager = metadataManager;
         this.serviceDataIndexes = new ConcurrentHashMap<>();
         this.serviceClusterIndex = new ConcurrentHashMap<>();
-        this.namespaceServiceIndex = new ConcurrentHashMap<>();
     }
     
     public Set<String> getClusters(Service service) {
         return serviceClusterIndex.getOrDefault(service, new HashSet<>());
     }
     
-    public Collection<Service> getAllServicesOfNamespace(String namespace) {
-        return namespaceServiceIndex.getOrDefault(namespace, new ConcurrentHashSet<>());
-    }
-    
     public ServiceInfo getData(Service service) {
         return serviceDataIndexes.containsKey(service) ? serviceDataIndexes.get(service) : getPushData(service);
     }
@@ -95,7 +86,6 @@ public class ServiceStorage {
         }
         result.setHosts(getAllInstancesFromIndex(service));
         serviceDataIndexes.put(service, result);
-        updateNamespaceIndex(service);
         return result;
     }
     
@@ -158,11 +148,4 @@ public class ServiceStorage {
         result.setHealthy(instancePublishInfo.isHealthy());
         return result;
     }
-    
-    private void updateNamespaceIndex(Service service) {
-        if (!namespaceServiceIndex.containsKey(service.getNamespace())) {
-            namespaceServiceIndex.putIfAbsent(service.getNamespace(), new ConcurrentHashSet<>());
-        }
-        namespaceServiceIndex.get(service.getNamespace()).add(service);
-    }
 }
diff --git a/naming/src/main/java/com/alibaba/nacos/naming/remote/handler/ServiceListRequestHandler.java b/naming/src/main/java/com/alibaba/nacos/naming/remote/handler/ServiceListRequestHandler.java
index b16d036db..299780b15 100644
--- a/naming/src/main/java/com/alibaba/nacos/naming/remote/handler/ServiceListRequestHandler.java
+++ b/naming/src/main/java/com/alibaba/nacos/naming/remote/handler/ServiceListRequestHandler.java
@@ -21,7 +21,7 @@ import com.alibaba.nacos.api.naming.remote.request.ServiceListRequest;
 import com.alibaba.nacos.api.naming.remote.response.ServiceListResponse;
 import com.alibaba.nacos.api.remote.request.RequestMeta;
 import com.alibaba.nacos.core.remote.RequestHandler;
-import com.alibaba.nacos.naming.core.v2.index.ServiceStorage;
+import com.alibaba.nacos.naming.core.v2.ServiceManager;
 import com.alibaba.nacos.naming.core.v2.pojo.Service;
 import com.alibaba.nacos.naming.utils.ServiceUtil;
 import org.springframework.stereotype.Component;
@@ -40,19 +40,14 @@ import java.util.Objects;
 @Component
 public class ServiceListRequestHandler extends RequestHandler<ServiceListRequest, ServiceListResponse> {
     
-    private final ServiceStorage serviceStorage;
-    
-    public ServiceListRequestHandler(ServiceStorage serviceStorage) {
-        this.serviceStorage = serviceStorage;
-    }
-    
     @Override
     public ServiceListResponse handle(ServiceListRequest request, RequestMeta meta) throws NacosException {
-        Collection<Service> serviceSet = serviceStorage.getAllServicesOfNamespace(request.getNamespace());
+        Collection<Service> serviceSet = ServiceManager.getInstance().getSingletons(request.getNamespace());
         ServiceListResponse result = ServiceListResponse.buildSuccessResponse(0, new LinkedList<>());
         if (!serviceSet.isEmpty()) {
             Collection<String> serviceNameSet = selectServiceWithGroupName(serviceSet, request.getGroupName());
-            List<String> serviceNameList = ServiceUtil.pageServiceName(request.getPageNo(), request.getPageSize(), serviceNameSet);
+            List<String> serviceNameList = ServiceUtil
+                    .pageServiceName(request.getPageNo(), request.getPageSize(), serviceNameSet);
             result.setCount(serviceNameList.size());
             result.setServiceNames(serviceNameList);
         }