diff --git a/src/SKIT.FlurlHttpClient.Wechat.OpenAI/Utilities/Internal/JwtUtility.cs b/src/SKIT.FlurlHttpClient.Wechat.OpenAI/Utilities/Internal/JwtUtility.cs
new file mode 100644
index 00000000..3e7495b5
--- /dev/null
+++ b/src/SKIT.FlurlHttpClient.Wechat.OpenAI/Utilities/Internal/JwtUtility.cs
@@ -0,0 +1,25 @@
+using System;
+using JWT;
+using JWT.Algorithms;
+using JWT.Serializers;
+using Newtonsoft.Json;
+
+namespace SKIT.FlurlHttpClient.Wechat.OpenAI.Utilities
+{
+    internal static class JwtUtility
+    {
+        private static readonly Lazy<IJwtEncoder> _encoder = new Lazy<IJwtEncoder>(() =>
+        {
+            IJwtAlgorithm algorithm = new HMACSHA256Algorithm();
+            IJsonSerializer serializer = new JsonNetSerializer(new JsonSerializer() { NullValueHandling = NullValueHandling.Ignore });
+            IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
+            IJwtEncoder encoder = new JwtEncoder(algorithm, serializer, urlEncoder);
+            return encoder;
+        }, isThreadSafe: true);
+
+        public static string EncodeWithHS256(object payload, string secret)
+        {
+            return _encoder.Value.Encode(payload, secret);
+        }
+    }
+}
diff --git a/src/SKIT.FlurlHttpClient.Wechat.TenpayV2/Utilities/Internal/JsonUtility.cs b/src/SKIT.FlurlHttpClient.Wechat.TenpayV2/Utilities/Internal/JsonUtility.cs
index bbb1ef2e..d6fc4608 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.TenpayV2/Utilities/Internal/JsonUtility.cs
+++ b/src/SKIT.FlurlHttpClient.Wechat.TenpayV2/Utilities/Internal/JsonUtility.cs
@@ -1,7 +1,7 @@
-using System.Linq;
+using System.Collections.Generic;
+using System.Linq;
 using System.Text;
-using Newtonsoft.Json;
-using Newtonsoft.Json.Linq;
+using System.Text.Json.Nodes;
 
 namespace SKIT.FlurlHttpClient.Wechat.TenpayV2.Utilities
 {
@@ -13,22 +13,15 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV2.Utilities
                 return string.Empty;
 
             StringBuilder stringBuilder = new StringBuilder();
-
-            JObject jObject = JsonConvert.DeserializeObject<JObject>(json);
-            JProperty[] jProps = jObject.Properties().OrderBy(p => p.Name).ToArray();
-            foreach (JProperty jProp in jProps)
+            JsonObject jObject = JsonNode.Parse(json)!.AsObject();
+            foreach (KeyValuePair<string, JsonNode?> jProp in jObject.OrderBy(p => p.Key))
             {
-                if (jProp.Value.Type == JTokenType.Null)
-                {
+                string key = jProp.Key;
+                string? value = jProp.Value?.ToString();
+                if (string.IsNullOrEmpty(value))
                     continue;
-                }
-                else if (jProp.Value.Type == JTokenType.String)
-                {
-                    if (string.IsNullOrEmpty((string)jProp.Value))
-                        continue;
-                }
 
-                stringBuilder.Append($"{jProp.Name}={jProp.Value}&");
+                stringBuilder.Append($"{key}={value}&");
             }
 
             return stringBuilder.ToString().TrimEnd('&');
diff --git a/test/SKIT.FlurlHttpClient.Wechat.OpenAI.UnitTests/TestCase_JwtUtilityTests.cs b/test/SKIT.FlurlHttpClient.Wechat.OpenAI.UnitTests/TestCase_JwtUtilityTests.cs
new file mode 100644
index 00000000..4a1f42e5
--- /dev/null
+++ b/test/SKIT.FlurlHttpClient.Wechat.OpenAI.UnitTests/TestCase_JwtUtilityTests.cs
@@ -0,0 +1,26 @@
+using Xunit;
+
+namespace SKIT.FlurlHttpClient.Wechat.OpenAI.UnitTests
+{
+    public class TestCase_JwtUtilityTests
+    {
+        [Fact(DisplayName = "测试用例：JWT HS256 编码")]
+        public void TestJWTEncodeWithHS256()
+        {
+            object payload = new
+            {
+                uid = "xjlsj33lasfaf",
+                data = new
+                {
+                    q = "在微信智言与微信智聆两大技术的支持下，微信AI团队推出了“微信对话开放平台”和“腾讯小微”智能硬件两大核心产品。微信支付团队最新发布的“微信青蛙Pro”在现场设置了体验区，让大家感受AI认脸的本事。"
+                }
+            };
+            string secret = "jWmYm7qr5nMoAUwZRjGtBxmz3KA1tkAj3ykkR6q2B2C";
+
+            string actualJwt = Utilities.JwtUtility.EncodeWithHS256(payload: payload, secret: secret);
+            string expectedJwt = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1aWQiOiJ4amxzajMzbGFzZmFmIiwiZGF0YSI6eyJxIjoi5Zyo5b6u5L-h5pm66KiA5LiO5b6u5L-h5pm66IGG5Lik5aSn5oqA5pyv55qE5pSv5oyB5LiL77yM5b6u5L-hQUnlm6LpmJ_mjqjlh7rkuobigJzlvq7kv6Hlr7nor53lvIDmlL7lubPlj7DigJ3lkozigJzohb7orq_lsI_lvq7igJ3mmbrog73noazku7bkuKTlpKfmoLjlv4Pkuqflk4HjgILlvq7kv6HmlK_ku5jlm6LpmJ_mnIDmlrDlj5HluIPnmoTigJzlvq7kv6HpnZLom5lQcm_igJ3lnKjnjrDlnLrorr7nva7kuobkvZPpqozljLrvvIzorqnlpKflrrbmhJ_lj5dBSeiupOiEuOeahOacrOS6i-OAgiJ9fQ.8FeSvxKlIrbI6MCAaWGekB4sHGA8DeUxgVXiHa8ulJk";
+
+            Assert.Equal(expectedJwt, actualJwt, ignoreCase: true);
+        }
+    }
+}