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 ffbbec1e3..680622be9 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
@@ -1,5 +1,6 @@
 using LINGYUN.Abp.Saas.Features;
 using Microsoft.AspNetCore.Authorization;
+using Microsoft.Extensions.Logging;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -8,7 +9,6 @@ using Volo.Abp;
 using Volo.Abp.Application.Dtos;
 using Volo.Abp.Data;
 using Volo.Abp.EventBus.Distributed;
-using Volo.Abp.Features;
 using Volo.Abp.MultiTenancy;
 using Volo.Abp.ObjectExtending;
 
@@ -20,15 +20,18 @@ public class TenantAppService : AbpSaasAppServiceBase, ITenantAppService
     protected IDistributedEventBus EventBus { get; }
     protected ITenantRepository TenantRepository { get; }
     protected ITenantManager TenantManager { get; }
+    protected IConnectionStringChecker ConnectionStringChecker { get; }
 
     public TenantAppService(
         ITenantRepository tenantRepository,
         ITenantManager tenantManager,
-        IDistributedEventBus eventBus)
+        IDistributedEventBus eventBus,
+        IConnectionStringChecker connectionStringChecker)
     {
         EventBus = eventBus;
         TenantRepository = tenantRepository;
         TenantManager = tenantManager;
+        ConnectionStringChecker = connectionStringChecker;
     }
 
     public async virtual Task<TenantDto> GetAsync(Guid id)
@@ -80,6 +83,7 @@ public class TenantAppService : AbpSaasAppServiceBase, ITenantAppService
 
         if (!input.UseSharedDatabase && !input.DefaultConnectionString.IsNullOrWhiteSpace())
         {
+            await CheckConnectionString(input.DefaultConnectionString);
             tenant.SetDefaultConnectionString(input.DefaultConnectionString);
         }
 
@@ -87,6 +91,7 @@ public class TenantAppService : AbpSaasAppServiceBase, ITenantAppService
         {
             foreach (var connectionString in input.ConnectionStrings)
             {
+                await CheckConnectionString(connectionString.Value, connectionString.Key);
                 tenant.SetConnectionString(connectionString.Key, connectionString.Value);
             }
         }
@@ -119,6 +124,7 @@ public class TenantAppService : AbpSaasAppServiceBase, ITenantAppService
             await EventBus.PublishAsync(eto);
         });
 
+
         await CurrentUnitOfWork.SaveChangesAsync();
 
         return ObjectMapper.Map<Tenant, TenantDto>(tenant);
@@ -157,12 +163,17 @@ public class TenantAppService : AbpSaasAppServiceBase, ITenantAppService
         }
 
         // 租户删除时查询会失效, 在删除前确认
-        var strategy = await FeatureChecker.GetAsync(SaasFeatureNames.Tenant.RecycleStrategy, RecycleStrategy.Recycle);
+        var recycleStrategy = RecycleStrategy.Recycle;
+        var strategySet = await FeatureChecker.GetOrNullAsync(SaasFeatureNames.Tenant.RecycleStrategy);
+        if (!strategySet.IsNullOrWhiteSpace() && Enum.TryParse<RecycleStrategy>(strategySet, out var strategy))
+        {
+            recycleStrategy = strategy;
+        }
         var eto = new TenantDeletedEto
         {
             Id = tenant.Id,
             Name = tenant.Name,
-            Strategy = strategy,
+            Strategy = recycleStrategy,
             EntityVersion = tenant.EntityVersion,
             DefaultConnectionString = tenant.FindDefaultConnectionString(),
         };
@@ -259,4 +270,34 @@ public class TenantAppService : AbpSaasAppServiceBase, ITenantAppService
 
         await CurrentUnitOfWork.SaveChangesAsync();
     }
+
+    protected async virtual Task CheckConnectionString(string connectionString, string name = null)
+    {
+        try
+        {
+            var checkResult = await ConnectionStringChecker.CheckAsync(connectionString);
+            // 检查连接是否可用
+            if (!checkResult.Connected)
+            {
+                throw name.IsNullOrWhiteSpace()
+                    ? new BusinessException(AbpSaasErrorCodes.InvalidDefaultConnectionString)
+                    : new BusinessException(AbpSaasErrorCodes.InvalidConnectionString)
+                        .WithData("Name", name);
+            }
+            // 默认连接字符串改变不能影响到现有数据库
+            if (checkResult.DatabaseExists && name.IsNullOrWhiteSpace())
+            {
+                throw new BusinessException(AbpSaasErrorCodes.DefaultConnectionStringDatabaseExists);
+            }
+        }
+        catch (Exception e)
+        {
+            Logger.LogWarning("An error occurred while checking the validity of the connection string");
+            Logger.LogWarning(e.Message);
+            throw name.IsNullOrWhiteSpace() 
+                ? new BusinessException(AbpSaasErrorCodes.InvalidDefaultConnectionString)
+                : new BusinessException(AbpSaasErrorCodes.InvalidConnectionString)
+                    .WithData("Name", name);
+        }
+    }
 }
diff --git a/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain.Shared/LINGYUN/Abp/Saas/AbpSaasErrorCodes.cs b/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain.Shared/LINGYUN/Abp/Saas/AbpSaasErrorCodes.cs
index ec33cb29b..851e4642d 100644
--- a/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain.Shared/LINGYUN/Abp/Saas/AbpSaasErrorCodes.cs
+++ b/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain.Shared/LINGYUN/Abp/Saas/AbpSaasErrorCodes.cs
@@ -7,4 +7,16 @@ public static class AbpSaasErrorCodes
     public const string DuplicateEditionDisplayName = Namespace + ":010001";
     public const string DeleteUsedEdition = Namespace + ":010002";
     public const string DuplicateTenantName = Namespace + ":020001";
+    /// <summary>
+    /// 无效的默认连接字符串
+    /// </summary>
+    public const string InvalidDefaultConnectionString = Namespace + ":020101";
+    /// <summary>
+    /// 默认连接字符串指向的数据库已经存在
+    /// </summary>
+    public const string DefaultConnectionStringDatabaseExists = Namespace + ":020102";
+    /// <summary>
+    /// {Name} 的连接字符串无效
+    /// </summary>
+    public const string InvalidConnectionString = Namespace + ":020103";
 }
diff --git a/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain.Shared/LINGYUN/Abp/Saas/Localization/Resources/en.json b/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain.Shared/LINGYUN/Abp/Saas/Localization/Resources/en.json
index 4054a2cb5..1f6f1d75c 100644
--- a/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain.Shared/LINGYUN/Abp/Saas/Localization/Resources/en.json
+++ b/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain.Shared/LINGYUN/Abp/Saas/Localization/Resources/en.json
@@ -4,7 +4,9 @@
     "Saas:010001": "Unable to create duplicate editions {DisplayName}!",
     "Saas:010002": "Tried to delete the edition in use: {DisplayName}!",
     "Saas:020001": "Unable to create duplicate tenants {Name}!",
-    "Saas:020002": "The database string that cannot be connected!",
+    "Saas:020101": "The default connection string cannot open a connection to the database!",
+    "Saas:020102": "The database pointed to by the default connection string already exists!",
+    "Saas:020103": "Unable to open the database connection pointed to by {Name}!",
     "Volo.AbpIo.MultiTenancy:010001": "The tenant is unavailable or restricted!",
     "Volo.AbpIo.MultiTenancy:010002": "Tenant unavailable!",
     "Menu:Saas": "Saas",
diff --git a/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain.Shared/LINGYUN/Abp/Saas/Localization/Resources/zh-Hans.json b/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain.Shared/LINGYUN/Abp/Saas/Localization/Resources/zh-Hans.json
index cce383bb1..4f974c1ef 100644
--- a/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain.Shared/LINGYUN/Abp/Saas/Localization/Resources/zh-Hans.json
+++ b/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain.Shared/LINGYUN/Abp/Saas/Localization/Resources/zh-Hans.json
@@ -4,7 +4,9 @@
     "Saas:010001": "已经存在名为 {DisplayName} 的版本!",
     "Saas:010002": "试图删除正在使用的版本: {DisplayName}!",
     "Saas:020001": "已经存在名为 {Name} 的租户!",
-    "Saas:020002": "无法连接的数据库字符串!",
+    "Saas:020101": "无法打开默认连接字符串指向的数据库连接!",
+    "Saas:020102": "默认连接字符串指向的数据库已经存在!",
+    "Saas:020103": "无法打开 {Name} 指向的数据库连接!",
     "Volo.AbpIo.MultiTenancy:010001": "租户不可用或受限制!",
     "Volo.AbpIo.MultiTenancy:010002": "租户不可用!",
     "Menu:Saas": "Saas",
diff --git a/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain/LINGYUN/Abp/Saas/Features/SaasFeatureDefinitionProvider.cs b/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain/LINGYUN/Abp/Saas/Features/SaasFeatureDefinitionProvider.cs
index 62f036f69..4e3a508d4 100644
--- a/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain/LINGYUN/Abp/Saas/Features/SaasFeatureDefinitionProvider.cs
+++ b/aspnet-core/modules/saas/LINGYUN.Abp.Saas.Domain/LINGYUN/Abp/Saas/Features/SaasFeatureDefinitionProvider.cs
@@ -18,22 +18,22 @@ public class SaasFeatureDefinitionProvider : FeatureDefinitionProvider
             ItemSource = new StaticSelectionStringValueItemSource(
                 new LocalizableSelectionStringValueItem
                 {
-                    Value = RecycleStrategy.Reserve.ToString(),
+                    Value = "0",
                     DisplayText = new LocalizableStringInfo(
-                    LocalizationResourceNameAttribute.GetName(typeof(AbpSaasResource)),
-                    "RecycleStrategy:Reserve")
+                        LocalizationResourceNameAttribute.GetName(typeof(AbpSaasResource)),
+                        "RecycleStrategy:Reserve")
                 },
                 new LocalizableSelectionStringValueItem
                 {
-                    Value = RecycleStrategy.Recycle.ToString(),
+                    Value = "1",
                     DisplayText = new LocalizableStringInfo(
-                LocalizationResourceNameAttribute.GetName(typeof(AbpSaasResource)),
-                "RecycleStrategy:Recycle")
+                        LocalizationResourceNameAttribute.GetName(typeof(AbpSaasResource)),
+                        "RecycleStrategy:Recycle")
                 })
         };
         saas.AddFeature(
             name: SaasFeatureNames.Tenant.RecycleStrategy,
-            defaultValue: RecycleStrategy.Recycle.ToString(),
+            defaultValue: "1",
             displayName: L("Features:RecycleStrategy"),
             description: L("Features:RecycleStrategyDesc"),
             valueType: selectionValueType,