diff --git a/src/BD.WTTS.Client.Plugins.Accelerator/Services/Mvvm/ProxyService.Operate.cs b/src/BD.WTTS.Client.Plugins.Accelerator/Services/Mvvm/ProxyService.Operate.cs
index 31c20d3e61b..d8e74d40afd 100644
--- a/src/BD.WTTS.Client.Plugins.Accelerator/Services/Mvvm/ProxyService.Operate.cs
+++ b/src/BD.WTTS.Client.Plugins.Accelerator/Services/Mvvm/ProxyService.Operate.cs
@@ -82,7 +82,11 @@ async Task<OperateProxyServiceResult> StartProxyServiceCoreAsync()
             }
             else
             {
-                proxyDNS = await GetFastestDNSAsync(ProxySettingsWindowViewModel.ProxyDNSs.Skip(1));
+                if(proxyDNS.compare(ProxySettingsWindowViewModel.ProxyDNSs.ElementAt(0))!=0){//Check if proxyDNS equals "System Default"
+                    proxyDNS = await GetFastestDNSAsync(ProxySettingsWindowViewModel.ProxyDNSs.Skip(1).Append(proxyDNS));
+                }else{
+                    proxyDNS = await GetFastestDNSAsync(ProxySettingsWindowViewModel.ProxyDNSs.Skip(1));
+                }
             }
         }
 
@@ -541,4 +545,4 @@ public bool OnStopedShowToastReturnProxyStatus()
         // 如果没有有效结果,返回默认值
         return null;
     }
-}
\ No newline at end of file
+}