diff --git a/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Application/LINGYUN/Abp/Saas/Tenants/TenantAppService.cs b/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Application/LINGYUN/Abp/Saas/Tenants/TenantAppService.cs
index 680622be9..b5564d8fa 100644
--- a/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Application/LINGYUN/Abp/Saas/Tenants/TenantAppService.cs
+++ b/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Application/LINGYUN/Abp/Saas/Tenants/TenantAppService.cs
@@ -213,6 +213,8 @@ public async virtual Task<ListResultDto<TenantConnectionStringDto>> GetConnectio
     [Authorize(AbpSaasPermissions.Tenants.ManageConnectionStrings)]
     public async virtual Task<TenantConnectionStringDto> SetConnectionStringAsync(Guid id, TenantConnectionStringCreateOrUpdate input)
     {
+        await CheckConnectionString(input.Value, input.Name);
+
         var tenant = await TenantRepository.GetAsync(id);
 
         var oldConnectionString = tenant.FindConnectionString(input.Name);