diff --git a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecutePayScoreBillExtensions.cs b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecutePayScoreBillExtensions.cs
index fde4cca8..eb82a52a 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecutePayScoreBillExtensions.cs
+++ b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecutePayScoreBillExtensions.cs
@@ -1,7 +1,5 @@
 using System;
-using System.Collections.Generic;
 using System.Net.Http;
-using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using Flurl;
@@ -34,9 +32,6 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV3
                 .SetQueryParam("tar_type", request.TarType)
                 .SetQueryParam("algorithm", request.Algorithm);
 
-            if (!string.IsNullOrEmpty(request.TarType))
-                flurlReq.SetQueryParam("tar_type", request.TarType);
-
             return await client.SendRequestWithJsonAsync<Models.GetPayScoreMerchantBillResponse>(flurlReq, cancellationToken: cancellationToken);
         }
     }