diff --git a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecuteCertificatesExtensions.cs b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecuteCertificatesExtensions.cs
index 940a272e..08136475 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecuteCertificatesExtensions.cs
+++ b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecuteCertificatesExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
@@ -34,6 +34,9 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV3
             IFlurlRequest flurlReq = client
                 .CreateRequest(request, HttpMethod.Get, "certificates");
 
+            if (request.AlgorithmType != null)
+                flurlReq.SetQueryParam("algorithm_type", request.AlgorithmType);
+
             return await client.SendRequestWithJsonAsync<Models.QueryCertificatesResponse>(flurlReq, data: request, cancellationToken: cancellationToken);
         }
     }
diff --git a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/Certificates/QueryCertificatesRequest.cs b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/Certificates/QueryCertificatesRequest.cs
index 03be1566..652018f7 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/Certificates/QueryCertificatesRequest.cs
+++ b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/Certificates/QueryCertificatesRequest.cs
@@ -1,9 +1,15 @@
-namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Models
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Models
 {
     /// <summary>
     /// <para>表示 [GET] /certificates 接口的请求。</para>
     /// </summary>
     public class QueryCertificatesRequest : WechatTenpayRequest
     {
+        /// <summary>
+        /// 获取或设置算法类型。
+        /// </summary>
+        [Newtonsoft.Json.JsonIgnore]
+        [System.Text.Json.Serialization.JsonIgnore]
+        public string? AlgorithmType { get; set; }
     }
 }