diff --git a/server/HoneyBox/src/HoneyBox.Core/Services/WechatService.cs b/server/HoneyBox/src/HoneyBox.Core/Services/WechatService.cs
index ba9e3f02..6a7a7edd 100644
--- a/server/HoneyBox/src/HoneyBox.Core/Services/WechatService.cs
+++ b/server/HoneyBox/src/HoneyBox.Core/Services/WechatService.cs
@@ -20,6 +20,7 @@ public class WechatService : IWechatService
     private readonly WechatPaySettings _wechatPaySettings;
     private readonly IRedisService _redisService;
     private readonly HoneyBoxDbContext _dbContext;
+    private readonly IWechatPayConfigService? _wechatPayConfigService;
 
     // 微信API端点
     private const string WechatCodeToSessionUrl = "https://api.weixin.qq.com/sns/jscode2session";
@@ -35,13 +36,15 @@ public class WechatService : IWechatService
         ILogger<WechatService> logger, 
         IOptions<WechatPaySettings> wechatPaySettings,
         IRedisService redisService,
-        HoneyBoxDbContext dbContext)
+        HoneyBoxDbContext dbContext,
+        IWechatPayConfigService? wechatPayConfigService = null)
     {
         _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         _wechatPaySettings = wechatPaySettings?.Value ?? throw new ArgumentNullException(nameof(wechatPaySettings));
         _redisService = redisService ?? throw new ArgumentNullException(nameof(redisService));
         _dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
+        _wechatPayConfigService = wechatPayConfigService;
     }
 
     /// <summary>
@@ -1110,8 +1113,19 @@ public class WechatService : IWechatService
     /// </summary>
     private async Task<WechatPayMerchantConfig?> GetMerchantConfigByOrderNoAsync(string orderNo)
     {
-        // 直接使用现有的 GetMerchantConfigAsync 方法获取默认商户配置
-        // 该方法已经从数据库读取配置并支持缓存
+        // 优先使用 WechatPayConfigService（支持多商户配置）
+        if (_wechatPayConfigService != null)
+        {
+            var config = _wechatPayConfigService.GetMerchantByOrderNo(orderNo);
+            if (!string.IsNullOrEmpty(config.MchId))
+            {
+                _logger.LogInformation("[发货] 使用 WechatPayConfigService 获取商户配置: MchId={MchId}, AppId={AppId}", 
+                    config.MchId, config.AppId);
+                return config;
+            }
+        }
+
+        // 回退到旧的配置读取方式
         return await GetMerchantConfigAsync();
     }
 
diff --git a/server/HoneyBox/src/HoneyBox.Infrastructure/Modules/ServiceModule.cs b/server/HoneyBox/src/HoneyBox.Infrastructure/Modules/ServiceModule.cs
index 48d90849..6e7b5af6 100644
--- a/server/HoneyBox/src/HoneyBox.Infrastructure/Modules/ServiceModule.cs
+++ b/server/HoneyBox/src/HoneyBox.Infrastructure/Modules/ServiceModule.cs
@@ -29,7 +29,8 @@ public class ServiceModule : Module
             var wechatPaySettings = c.Resolve<Microsoft.Extensions.Options.IOptions<WechatPaySettings>>();
             var redisService = c.Resolve<IRedisService>();
             var dbContext = c.Resolve<HoneyBoxDbContext>();
-            return new WechatService(httpClientFactory.CreateClient(), logger, wechatPaySettings, redisService, dbContext);
+            var configService = c.ResolveOptional<IWechatPayConfigService>();
+            return new WechatService(httpClientFactory.CreateClient(), logger, wechatPaySettings, redisService, dbContext, configService);
         }).As<IWechatService>().InstancePerLifetimeScope();
 
         // 注册 IP 地理位置服务