diff --git a/src/main/java/com/actiontech/dble/config/ConfigInitializer.java b/src/main/java/com/actiontech/dble/config/ConfigInitializer.java
index c5540fbc4d..98c382ac54 100644
--- a/src/main/java/com/actiontech/dble/config/ConfigInitializer.java
+++ b/src/main/java/com/actiontech/dble/config/ConfigInitializer.java
@@ -200,12 +200,14 @@ public void testConnection() {
             // check whether dbInstance is connected
             String dbGroupName;
             PhysicalDbGroup dbGroup;
+            boolean skipTestConnectionOnUpdate = false;
             if (SystemConfig.getInstance().isSkipTestConOnUpdate()) {
                 if (reloadContext != null && !reloadContext.getAffectDbInstanceList().isEmpty()) {
                     boolean useSharding = reloadContext.getAffectDbInstanceList().stream().map(ele -> dbGroups.get(ele.getGroupName())).anyMatch((ele) -> ele != null && !ele.isShardingUseless());
-                    if (useSharding) {
-                        //not support for sharding db group
-                        reloadContext.getAffectDbInstanceList().clear();
+
+                    //not support for sharding db group
+                    if (!useSharding) {
+                        skipTestConnectionOnUpdate = true;
                     }
                 }
             }
@@ -221,14 +223,12 @@ public void testConnection() {
                 }
 
                 for (PhysicalDbInstance ds : dbGroup.getDbInstances(true)) {
-                    if (SystemConfig.getInstance().isSkipTestConOnUpdate()) {
-                        if (reloadContext != null && !reloadContext.getAffectDbInstanceList().isEmpty()) {
-                            String finalDbGroupName = dbGroupName;
-                            boolean find = reloadContext.getAffectDbInstanceList().stream().anyMatch((ele) -> ele.getGroupName().equals(finalDbGroupName) && ele.getInstanceName().equals(ds.getName()));
-                            if (!find) {
-                                //skip test connection on this dbInstance
-                                continue;
-                            }
+                    if (skipTestConnectionOnUpdate) {
+                        String finalDbGroupName = dbGroupName;
+                        boolean find = reloadContext.getAffectDbInstanceList().stream().anyMatch((ele) -> ele.getGroupName().equals(finalDbGroupName) && ele.getInstanceName().equals(ds.getName()));
+                        if (!find) {
+                            //skip test connection on this dbInstance
+                            continue;
                         }
                     }
                     if (ds.getConfig().isDisabled()) {
diff --git a/src/main/java/com/actiontech/dble/services/manager/handler/UpdateHandler.java b/src/main/java/com/actiontech/dble/services/manager/handler/UpdateHandler.java
index cda8dca362..6fe539f620 100644
--- a/src/main/java/com/actiontech/dble/services/manager/handler/UpdateHandler.java
+++ b/src/main/java/com/actiontech/dble/services/manager/handler/UpdateHandler.java
@@ -162,7 +162,7 @@ private int updateRows(ManagerService service, ManagerWritableTable managerTable
                     for (LinkedHashMap<String, String> affectPk : affectPks) {
                         String instanceName = affectPk.get("name");
                         String dbGroup = affectPk.get("db_group");
-                        reloadContext.getAffectDbInstanceList().add(new UniqueDbInstance(dbGroup, instanceName));
+                        reloadContext.addAffectDbInstance(new UniqueDbInstance(dbGroup, instanceName));
                     }
                 }
                 ReloadConfig.execute(service, 0, false, new ConfStatus(ConfStatus.Status.MANAGER_UPDATE, managerTable.getTableName()), reloadContext);
diff --git a/src/main/java/com/actiontech/dble/services/manager/response/ReloadContext.java b/src/main/java/com/actiontech/dble/services/manager/response/ReloadContext.java
index 0de824ccd0..3511c32f54 100644
--- a/src/main/java/com/actiontech/dble/services/manager/response/ReloadContext.java
+++ b/src/main/java/com/actiontech/dble/services/manager/response/ReloadContext.java
@@ -7,12 +7,17 @@
 package com.actiontech.dble.services.manager.response;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 public class ReloadContext {
-    List<UniqueDbInstance> affectDbInstanceList = new ArrayList<>();
+    private final List<UniqueDbInstance> affectDbInstanceList = new ArrayList<>();
 
     public List<UniqueDbInstance> getAffectDbInstanceList() {
-        return affectDbInstanceList;
+        return Collections.unmodifiableList(affectDbInstanceList);
+    }
+
+    public void addAffectDbInstance(UniqueDbInstance dbInstance) {
+        affectDbInstanceList.add(dbInstance);
     }
 }