diff --git a/src/AgileConfig.Server.Common/Encrypt.cs b/src/AgileConfig.Server.Common/Encrypt.cs
index 6690345f..f4e68448 100644
--- a/src/AgileConfig.Server.Common/Encrypt.cs
+++ b/src/AgileConfig.Server.Common/Encrypt.cs
@@ -1,16 +1,17 @@
 using System;
 using System.Security.Cryptography;
 using System.Text;
+using System.Threading;
 
 namespace AgileConfig.Server.Common
 {
     public static class Encrypt
     {
-        private static readonly MD5 Md5Instance = MD5.Create();
+        private static readonly ThreadLocal<MD5> Md5Instance = new ThreadLocal<MD5>(MD5.Create);
         public static string Md5(string txt)
         {
             var inputBytes = Encoding.ASCII.GetBytes(txt);
-            var hashBytes = Md5Instance.ComputeHash(inputBytes);
+            var hashBytes = Md5Instance.Value.ComputeHash(inputBytes);
             return Convert.ToHexString(hashBytes);
         }
     }
diff --git a/test/AgileConfig.Server.CommonTests/EncryptTests.cs b/test/AgileConfig.Server.CommonTests/EncryptTests.cs
new file mode 100644
index 00000000..4660cf5a
--- /dev/null
+++ b/test/AgileConfig.Server.CommonTests/EncryptTests.cs
@@ -0,0 +1,28 @@
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AgileConfig.Server.Common.Tests;
+
+[TestClass]
+public class EncryptTests
+{
+    private const string Origin = "123456";
+    private const string Expected = "E10ADC3949BA59ABBE56E057F20F883E";
+
+    [TestMethod]
+    public void Md5Test()
+    {
+        var result = Encrypt.Md5(Origin);
+        Assert.AreEqual(Expected, result);
+    }
+
+    [TestMethod]
+    public void ParallelCallTest()
+    {
+        Parallel.For(0, 1000, _ =>
+        {
+            var result = Encrypt.Md5(Origin);
+            Assert.AreEqual(Expected, result);
+        });
+    }
+}
\ No newline at end of file