diff --git a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Settings/CertificateEntry.cs b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Settings/CertificateEntry.cs
index 607f8e17..ff1ac3d4 100644
--- a/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Settings/CertificateEntry.cs
+++ b/src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Settings/CertificateEntry.cs
@@ -28,6 +28,8 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Settings
         /// </summary>
         public DateTimeOffset ExpireTime { get; }
 
+        [Newtonsoft.Json.JsonConstructor]
+        [System.Text.Json.Serialization.JsonConstructor]
         public CertificateEntry(string serialNumber, string certificate, DateTimeOffset effectiveTime, DateTimeOffset expireTime)
         {
             if (string.IsNullOrEmpty(serialNumber))
diff --git a/test/SKIT.FlurlHttpClient.Wechat.TenpayV3.UnitTests/WechatTenpayCertificateManagerTests.cs b/test/SKIT.FlurlHttpClient.Wechat.TenpayV3.UnitTests/WechatTenpayCertificateManagerTests.cs
new file mode 100644
index 00000000..c1bf5eec
--- /dev/null
+++ b/test/SKIT.FlurlHttpClient.Wechat.TenpayV3.UnitTests/WechatTenpayCertificateManagerTests.cs
@@ -0,0 +1,30 @@
+using System;
+using Xunit;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.UnitTests
+{
+    public class WechatTenpayCertificateManagerTests
+    {
+        [Fact(DisplayName = "序列化与反序列化 `CertificateEntry`")]
+        public void CertificateEntrySerializationTest()
+        {
+            var entry = new Settings.CertificateEntry("SN", "-----BEGIN CERTIFICATE-----END CERTIFICATE-----", DateTimeOffset.Now, DateTimeOffset.Now);
+
+            var serialized1 = Newtonsoft.Json.JsonConvert.SerializeObject(entry);
+            var deserialized1 = Newtonsoft.Json.JsonConvert.DeserializeObject<Settings.CertificateEntry>(serialized1);
+
+            Assert.Equal(entry.SerialNumber, deserialized1.SerialNumber);
+            Assert.Equal(entry.Certificate, deserialized1.Certificate);
+            Assert.Equal(entry.EffectiveTime, deserialized1.EffectiveTime);
+            Assert.Equal(entry.ExpireTime, deserialized1.ExpireTime);
+
+            var serialized2 = System.Text.Json.JsonSerializer.Serialize(entry);
+            var deserialized2 = System.Text.Json.JsonSerializer.Deserialize<Settings.CertificateEntry>(serialized2);
+
+            Assert.Equal(entry.SerialNumber, deserialized2.SerialNumber);
+            Assert.Equal(entry.Certificate, deserialized2.Certificate);
+            Assert.Equal(entry.EffectiveTime, deserialized2.EffectiveTime);
+            Assert.Equal(entry.ExpireTime, deserialized2.ExpireTime);
+        }
+    }
+}