diff --git a/.justfile b/.justfile
index 5d979fb..551a2f3 100644
--- a/.justfile
+++ b/.justfile
@@ -3,6 +3,12 @@
   pwd
   echo
 
+clean: 
+  rm -rf "server/bin"
+  rm -rf "server/obj"
+  rm -rf "server.test/bin"
+  rm -rf "server.test/obj"
+
 [working-directory: "server"]
 publish: _show-dir
   dotnet publish --self-contained false -t:PublishAllRids
diff --git a/server/src/Common.cs b/server/src/Common.cs
index ab3d0e2..bc126ef 100644
--- a/server/src/Common.cs
+++ b/server/src/Common.cs
@@ -18,10 +18,10 @@ namespace Common
         {
             if (length > 8)
             {
-                throw new ArgumentException(
+                return new(new ArgumentException(
                     "Unsigned long number can't over 8 bytes(64 bits).",
                     nameof(length)
-                );
+                ));
             }
 
             var arr = new byte[length];
@@ -53,10 +53,10 @@ namespace Common
         {
             if (bytes.Length > 8)
             {
-                throw new ArgumentException(
+                return new(new ArgumentException(
                     "Unsigned long number can't over 8 bytes(64 bits).",
                     nameof(bytes)
-                );
+                ));
             }
 
             ulong num = 0;
@@ -106,7 +106,7 @@ namespace Common
         /// <returns>[TODO:return]</returns>
         public static Result<ulong> MultiBitsToNumber(ulong bits1, uint bits1Len, ulong bits2, uint bits2Len)
         {
-            if (bits1Len + bits2Len > 64) throw new ArgumentException("Two Bits is more than 64 bits");
+            if (bits1Len + bits2Len > 64) return new(new ArgumentException("Two Bits is more than 64 bits"));
 
             ulong num = (bits1 << Convert.ToInt32(bits2Len)) | bits2;
             return num;
@@ -122,7 +122,7 @@ namespace Common
         /// <returns>[TODO:return]</returns>
         public static Result<uint> MultiBitsToNumber(uint bits1, uint bits1Len, uint bits2, uint bits2Len)
         {
-            if (bits1Len + bits2Len > 64) throw new ArgumentException("Two Bits is more than 64 bits");
+            if (bits1Len + bits2Len > 64) return new(new ArgumentException("Two Bits is more than 64 bits"));
 
             uint num = (bits1 << Convert.ToInt32(bits2Len)) | bits2;
             return num;
diff --git a/server/src/Controllers.cs b/server/src/Controllers.cs
index 399e7c6..e76db1a 100644
--- a/server/src/Controllers.cs
+++ b/server/src/Controllers.cs
@@ -1,5 +1,6 @@
 using System.Net;
 using Common;
+using DotNext;
 using Microsoft.AspNetCore.Mvc;
 using Newtonsoft.Json;
 using WebProtocol;
@@ -149,6 +150,7 @@ public class JtagController : ControllerBase
     {
         return "This is Jtag Controller";
     }
+
     /// <summary>
     /// 执行一个Jtag命令
     /// </summary>
@@ -182,8 +184,16 @@ public class JtagController : ControllerBase
         var jtagCtrl = new JtagClient.Jtag(address, port);
         var ret = await jtagCtrl.ReadIDCode();
 
-        if (ret.IsSuccessful) { return TypedResults.Ok(ret.Value); }
-        else { return TypedResults.InternalServerError(ret.Error); }
+        if (ret.IsSuccessful)
+        {
+            logger.Info($"Get device {address} ID code: 0x{ret.Value:X4}");
+            return TypedResults.Ok(ret.Value);
+        }
+        else
+        {
+            logger.Error(ret.Error);
+            return TypedResults.InternalServerError(ret.Error);
+        }
     }
 
     /// <summary>
@@ -217,7 +227,8 @@ public class JtagController : ControllerBase
             await file.CopyToAsync(stream);
         }
 
-        return TypedResults.Ok("文件上传成功");
+        logger.Info($"Device {address} Upload Bitstream Successfully");
+        return TypedResults.Ok("Bitstream Upload Successfully");
     }
 
     /// <summary>
@@ -265,8 +276,16 @@ public class JtagController : ControllerBase
                 var jtagCtrl = new JtagClient.Jtag(address, port);
                 var ret = await jtagCtrl.DownloadBitstream(fileBytes);
 
-                if (ret.IsSuccessful) { return TypedResults.Ok(ret.Value); }
-                else { return TypedResults.InternalServerError(ret.Error); }
+                if (ret.IsSuccessful)
+                {
+                    logger.Info($"Device {address} dowload bitstream successfully");
+                    return TypedResults.Ok(ret.Value);
+                }
+                else
+                {
+                    logger.Error(ret.Error);
+                    return TypedResults.InternalServerError(ret.Error);
+                }
             }
         }
         catch (Exception error)
diff --git a/server/src/JtagClient.cs b/server/src/JtagClient.cs
index a724b18..6c5791e 100644
--- a/server/src/JtagClient.cs
+++ b/server/src/JtagClient.cs
@@ -213,23 +213,34 @@ public static class JtagCmd
     public const UInt32 CMD_JTAG_IDLE_DELAY = 0b0101;
 }
 
-class Jtag
+/// <summary>
+/// Jtag控制器
+/// </summary>
+public class Jtag
 {
+    private static readonly NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();
+
     readonly int timeout;
 
     readonly int port;
     readonly string address;
     private IPEndPoint ep;
 
-    public Jtag(string address, int port, int outTime = 2000)
+    /// <summary>
+    /// Jtag构造函数
+    /// </summary>
+    /// <param name="address">目标IP地址</param>
+    /// <param name="port">目标UDP端口</param>
+    /// <param name="timeout">超时时间</param>
+    public Jtag(string address, int port, int timeout = 2000)
     {
         this.address = address;
         this.port = port;
         this.ep = new IPEndPoint(IPAddress.Parse(address), port);
-        this.timeout = outTime;
+        this.timeout = timeout;
     }
 
-    public async ValueTask<Result<uint>> ReadFIFO(uint devAddr)
+    async ValueTask<Result<uint>> ReadFIFO(uint devAddr)
     {
         var ret = false;
         var opts = new SendAddrPackOptions();
@@ -242,23 +253,23 @@ class Jtag
         // Read Jtag State Register
         opts.IsWrite = false;
         ret = await UDPClientPool.SendAddrPackAsync(ep, new SendAddrPackage(opts));
-        if (!ret) throw new Exception("Send Address Package Failed!");
+        if (!ret) return new(new Exception("Send Address Package Failed!"));
 
         // Wait for Read Ack
         if (!MsgBus.IsRunning)
-            throw new Exception("Message Bus not Working!");
+            return new(new Exception("Message Bus not Working!"));
 
         var retPack = await MsgBus.UDPServer.WaitForDataAsync(address, port);
         if (!retPack.IsSuccessful || !retPack.Value.IsSuccessful)
-            throw new Exception("Send address package failed");
+            return new(new Exception("Send address package failed"));
 
         var retPackOpts = retPack.Value.Options;
         if (retPackOpts.Data is null)
-            throw new Exception($"Data is Null, package: {retPackOpts.ToString()}");
+            return new(new Exception($"Data is Null, package: {retPackOpts.ToString()}"));
 
         var retPackLen = retPackOpts.Data.Length;
         if (retPackLen != 4)
-            throw new Exception($"RecvDataPackage BodyData Length not Equal to 4: Total {retPackLen} bytes");
+            return new(new Exception($"RecvDataPackage BodyData Length not Equal to 4: Total {retPackLen} bytes"));
 
         return Convert.ToUInt32(Common.Number.BytesToNumber(retPackOpts.Data).Value);
     }
@@ -277,36 +288,36 @@ class Jtag
         // Write Jtag State Register
         opts.IsWrite = true;
         ret = await UDPClientPool.SendAddrPackAsync(ep, new SendAddrPackage(opts));
-        if (!ret) throw new Exception("Send 1st address package failed!");
+        if (!ret) return new(new Exception("Send 1st address package failed!"));
         // Send Data Package
         ret = await UDPClientPool.SendDataPackAsync(ep,
                 new SendDataPackage(Common.Number.NumberToBytes(data, 4).Value));
-        if (!ret) throw new Exception("Send data package failed!");
+        if (!ret) return new(new Exception("Send data package failed!"));
 
         // Check Msg Bus
         if (!MsgBus.IsRunning)
-            throw new Exception("Message bus not working!");
+            return new(new Exception("Message bus not working!"));
         // Wait for Write Ack
         var udpWriteAck = await MsgBus.UDPServer.WaitForAckAsync(address, port);
-        if (!udpWriteAck.IsSuccessful) throw udpWriteAck.Error;
+        if (!udpWriteAck.IsSuccessful) return new(udpWriteAck.Error);
         else if (!udpWriteAck.Value.IsSuccessful)
-            throw new Exception("Send address package failed");
+            return new(new Exception("Send address package failed"));
 
         // Read Jtag State Register
         opts.IsWrite = false;
         opts.Address = JtagAddr.STATE;
         ret = await UDPClientPool.SendAddrPackAsync(ep, new SendAddrPackage(opts));
-        if (!ret) throw new Exception("Send 2rd Address Package Failed!");
+        if (!ret) return new(new Exception("Send 2rd Address Package Failed!"));
         // Wait for Read Data
         var udpDataResp = await MsgBus.UDPServer.WaitForDataAsync(address, port);
-        if (!udpDataResp.IsSuccessful) throw udpDataResp.Error;
+        if (!udpDataResp.IsSuccessful) return new(udpDataResp.Error);
         else if (!udpDataResp.Value.IsSuccessful)
-            throw new Exception("Send address package failed");
+            return new(new Exception("Send address package failed"));
 
         return udpDataResp.Value;
     }
 
-    public async ValueTask<Result<RecvDataPackage>> WriteFIFO(UInt32 devAddr, byte[] dataArray)
+    async ValueTask<Result<RecvDataPackage>> WriteFIFO(UInt32 devAddr, byte[] dataArray)
     {
         var ret = false;
         var opts = new SendAddrPackOptions();
@@ -318,7 +329,7 @@ class Jtag
 
         // Check Msg Bus
         if (!MsgBus.IsRunning)
-            throw new Exception("Message bus not working!");
+            return new(new Exception("Message bus not working!"));
 
         var writeTimes = dataArray.Length / (256 * (32 / 8)) + 1;
         for (var i = 0; i < writeTimes; i++)
@@ -328,7 +339,7 @@ class Jtag
             opts.IsWrite = true;
             opts.BurstLength = isLastData ? (byte)(dataArray.Length - i * (256 * (32 / 8)) - 1) : (byte)255;
             ret = await UDPClientPool.SendAddrPackAsync(ep, new SendAddrPackage(opts));
-            if (!ret) throw new Exception("Send 1st address package failed!");
+            if (!ret) return new(new Exception("Send 1st address package failed!"));
             // Send Data Package
             ret = await UDPClientPool.SendDataPackAsync(ep,
                     new SendDataPackage(
@@ -337,13 +348,13 @@ class Jtag
                         dataArray[(i * (256 * (32 / 8)))..((i + 1) * (256 * (32 / 8)) - 1)]
                     )
                 );
-            if (!ret) throw new Exception("Send data package failed!");
+            if (!ret) return new(new Exception("Send data package failed!"));
 
             // Wait for Write Ack
             var udpWriteAck = await MsgBus.UDPServer.WaitForAckAsync(address, port);
-            if (!udpWriteAck.IsSuccessful) throw udpWriteAck.Error;
+            if (!udpWriteAck.IsSuccessful) return new(udpWriteAck.Error);
             else if (!udpWriteAck.Value.IsSuccessful)
-                throw new Exception("Send address package failed");
+                return new(new Exception("Send address package failed"));
         }
 
         // Read Jtag State Register
@@ -351,29 +362,29 @@ class Jtag
         opts.BurstLength = 0;
         opts.Address = JtagAddr.STATE;
         ret = await UDPClientPool.SendAddrPackAsync(ep, new SendAddrPackage(opts));
-        if (!ret) throw new Exception("Send 2rd Address Package Failed!");
+        if (!ret) return new(new Exception("Send 2rd Address Package Failed!"));
         // Wait for Read Data
         var udpDataResp = await MsgBus.UDPServer.WaitForDataAsync(address, port);
-        if (!udpDataResp.IsSuccessful) throw udpDataResp.Error;
+        if (!udpDataResp.IsSuccessful) return new(udpDataResp.Error);
         else if (!udpDataResp.Value.IsSuccessful)
-            throw new Exception("Send address package failed");
+            return new(new Exception("Send address package failed"));
 
         return udpDataResp.Value;
     }
 
-    public async ValueTask<Result<bool>> WriteFIFO
+    async ValueTask<Result<bool>> WriteFIFO
         (UInt32 devAddr, UInt32 data, UInt32 result, UInt32 resultMask = 0xFF_FF_FF_FF)
     {
         var ret = false;
         var retPack = await WriteFIFO(devAddr, data);
-        if (!retPack.IsSuccessful) throw retPack.Error;
+        if (!retPack.IsSuccessful) return new(retPack.Error);
 
         if (retPack.Value.Options.Data is null)
-            throw new Exception($"Data is Null, package: {retPack.Value.Options.ToString()}");
+            return new(new Exception($"Data is Null, package: {retPack.Value.Options.ToString()}"));
 
         var retPackLen = retPack.Value.Options.Data.Length;
         if (retPackLen != 4)
-            throw new Exception($"RecvDataPackage BodyData Length not Equal to 4: Total {retPackLen} bytes");
+            return new(new Exception($"RecvDataPackage BodyData Length not Equal to 4: Total {retPackLen} bytes"));
 
         if (Common.Number.BitsCheck(
                 Common.Number.BytesToNumber(retPack.Value.Options.Data).Value, result, resultMask))
@@ -382,18 +393,18 @@ class Jtag
         return ret;
     }
 
-    public async ValueTask<Result<bool>> WriteFIFO
+    async ValueTask<Result<bool>> WriteFIFO
         (UInt32 devAddr, byte[] data, UInt32 result, UInt32 resultMask = 0xFF_FF_FF_FF)
     {
         var ret = false;
         var retPack = await WriteFIFO(devAddr, data);
 
         if (retPack.Value.Options.Data is null)
-            throw new Exception($"Data is Null, package: {retPack.Value.Options.ToString()}");
+            return new(new Exception($"Data is Null, package: {retPack.Value.Options.ToString()}"));
 
         var retPackLen = retPack.Value.Options.Data.Length;
         if (retPackLen != 4)
-            throw new Exception($"RecvDataPackage BodyData Length not Equal to 4: Total {retPackLen} bytes");
+            return new(new Exception($"RecvDataPackage BodyData Length not Equal to 4: Total {retPackLen} bytes"));
 
         if (Common.Number.BitsCheck(
                 Common.Number.BytesToNumber(retPack.Value.Options.Data).Value, result, resultMask))
@@ -431,7 +442,7 @@ class Jtag
 
     async ValueTask<Result<bool>> IdleDelay(UInt32 milliseconds)
     {
-        if (milliseconds > Math.Pow(2, 28)) throw new Exception("Timespan is over 2^28 milliseconds");
+        if (milliseconds > Math.Pow(2, 28)) return new(new Exception("Timespan is over 2^28 milliseconds"));
 
         return await WriteFIFO(
                 JtagAddr.WRITE_CMD,
@@ -446,8 +457,8 @@ class Jtag
                 JtagAddr.WRITE_DATA,
                 Common.Number.MultiBitsToNumber(0, 22, command, JtagCmd.LEN_JTAG_DR).Value, 0, 0);
 
-            if (!ret.IsSuccessful) throw ret.Error;
-            else if (!ret.Value) throw new Exception("Write JTAG_DR_IDCODE Failed");
+            if (!ret.IsSuccessful) return new(ret.Error);
+            else if (!ret.Value) return new(new Exception("Write JTAG_DR_IDCODE Failed"));
         }
         {
             var ret = await WriteFIFO(
@@ -455,8 +466,8 @@ class Jtag
                 Common.Number.MultiBitsToNumber(JtagCmd.CMD_JTAG_LOAD_IR, JtagCmd.LEN_CMD_JTAG, 10, 28).Value,
                 0x01_00_00_00, JtagState.CMD_EXEC_FINISH);
 
-            if (!ret.IsSuccessful) throw ret.Error;
-            else if (!ret.Value) throw new Exception("Write CMD_JTAG_LOAD_IR Failed");
+            if (!ret.IsSuccessful) return new(ret.Error);
+            else if (!ret.Value) return new(new Exception("Write CMD_JTAG_LOAD_IR Failed"));
         }
         return await ClearWriteDataReg();
     }
@@ -464,7 +475,7 @@ class Jtag
     async ValueTask<Result<bool>> LoadDRCareInput(byte[] bytesArray)
     {
         var bytesLen = ((uint)(bytesArray.Length * 8));
-        if (bytesLen > Math.Pow(2, 28)) throw new Exception("Length is over 2^(28 - 3)");
+        if (bytesLen > Math.Pow(2, 28)) return new(new Exception("Length is over 2^(28 - 3)"));
 
         {
             var ret = await WriteFIFO(
@@ -472,21 +483,21 @@ class Jtag
                     Common.Number.MultiBitsToNumber(JtagCmd.CMD_JTAG_LOAD_DR_CAREI, JtagCmd.LEN_CMD_JTAG, bytesLen, 28).Value,
                     0x01_00_00_00, JtagState.CMD_EXEC_FINISH);
 
-            if (!ret.IsSuccessful) throw ret.Error;
-            else if (!ret.Value) throw new Exception("Write CMD_JTAG_LOAD_DR_CAREI Failed");
+            if (!ret.IsSuccessful) return new(ret.Error);
+            else if (!ret.Value) return new(new Exception("Write CMD_JTAG_LOAD_DR_CAREI Failed"));
         }
         {
             var ret = await WriteFIFO(JtagAddr.WRITE_DATA, bytesArray, 0x01_00_00_00, JtagState.CMD_EXEC_FINISH);
 
-            if (!ret.IsSuccessful) throw ret.Error;
-            else if (!ret.Value) throw new Exception("Write Data Failed");
+            if (!ret.IsSuccessful) return new(ret.Error);
+            else if (!ret.Value) return new(new Exception("Write Data Failed"));
         }
         return true;
     }
 
     async ValueTask<Result<UInt32>> LoadDRCareOutput(UInt32 bytesLen)
     {
-        if (bytesLen > Math.Pow(2, 28)) throw new Exception("Length is over 2^(28 - 3)");
+        if (bytesLen > Math.Pow(2, 28)) return new(new Exception("Length is over 2^(28 - 3)"));
 
         var ret = await WriteFIFO(
                 JtagAddr.WRITE_CMD,
@@ -496,7 +507,7 @@ class Jtag
         if (ret.Value)
             return await ReadFIFO(JtagAddr.READ_DATA);
         else
-            throw new Exception("LoadDRCareo Failed!");
+            return new(new Exception("LoadDRCareo Failed!"));
     }
 
     public async ValueTask<Result<uint>> ReadIDCode()
@@ -504,28 +515,30 @@ class Jtag
         // Clear Data
         await MsgBus.UDPServer.ClearUDPData(this.address);
 
+        logger.Trace($"Clear up udp server {this.address} receive data");
+
         Result<bool> ret;
 
         ret = await ClearAllRegisters();
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Clear All Registers Failed");
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Clear All Registers Failed"));
 
         ret = await RunTest();
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Run Test Failed");
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Run Test Failed"));
 
         ret = await ExecRDCmd(JtagCmd.JTAG_DR_IDCODE);
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Execute Command JTAG_DR_IDCODE Failed");
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Execute Command JTAG_DR_IDCODE Failed"));
 
         ret = await ClearWriteDataReg();
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Clear Write Registers Failed");
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Clear Write Registers Failed"));
 
         var retData = await LoadDRCareOutput(4);
         if (!retData.IsSuccessful)
         {
-            throw new Exception("Get ID Code Failed");
+            return new(new Exception("Get ID Code Failed"));
         }
 
         return retData.Value;
@@ -536,66 +549,66 @@ class Jtag
         // Clear Data
         await MsgBus.UDPServer.ClearUDPData(this.address);
 
+        logger.Trace($"Clear up udp server {this.address} receive data");
+
         Result<bool> ret;
 
         ret = await CloseTest();
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Close Test Failed");
-
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Close Test Failed"));
 
         ret = await RunTest();
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Run Test Failed");
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Run Test Failed"));
 
+        logger.Trace("Jtag initialize");
 
         ret = await ExecRDCmd(JtagCmd.JTAG_DR_JRST);
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Execute Command JTAG_DR_JRST Failed");
-
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Execute Command JTAG_DR_JRST Failed"));
 
         ret = await RunTest();
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Run Test Failed");
-
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Run Test Failed"));
 
         ret = await ExecRDCmd(JtagCmd.JTAG_DR_CFGI);
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Execute Command JTAG_DR_CFGI Failed");
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Execute Command JTAG_DR_CFGI Failed"));
 
+        logger.Trace("Jtag ready to write bitstream");
 
         ret = await IdleDelay(75000);
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag IDLE Delay Failed");
-
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag IDLE Delay Failed"));
 
         ret = await LoadDRCareInput(bitstream);
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Load Data Failed");
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Load Data Failed"));
 
+        logger.Trace("Jtag write bitstream");
 
         ret = await CloseTest();
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Close Test Failed");
-
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Close Test Failed"));
 
         ret = await RunTest();
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Run Test Failed");
-
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Run Test Failed"));
 
         ret = await ExecRDCmd(JtagCmd.JTAG_DR_JWAKEUP);
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Execute Command JTAG_DR_JWAKEUP Failed");
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Execute Command JTAG_DR_JWAKEUP Failed"));
 
+        logger.Trace("Jtag reset device");
 
         ret = await IdleDelay(1000);
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag IDLE Delay Failed");
-
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag IDLE Delay Failed"));
 
         ret = await CloseTest();
-        if (!ret.IsSuccessful) throw ret.Error;
-        else if (!ret.Value) throw new Exception("Jtag Close Test Failed");
+        if (!ret.IsSuccessful) return new(ret.Error);
+        else if (!ret.Value) return new(new Exception("Jtag Close Test Failed"));
+        logger.Trace("Jtag download bitstream successfully");
 
         return true;
     }
diff --git a/server/src/UdpServer.cs b/server/src/UdpServer.cs
index e5f15f2..b17937b 100644
--- a/server/src/UdpServer.cs
+++ b/server/src/UdpServer.cs
@@ -5,6 +5,7 @@ using System.Text;
 using DotNext;
 using DotNext.Threading;
 using Newtonsoft.Json;
+using WebProtocol;
 
 /// <summary> UDP接受数据包格式 </summary>
 public class UDPData
@@ -58,9 +59,6 @@ public class UDPData
     }
 }
 
-/// <summary>
-/// UDP Server
-/// </summary>
 /// <summary>
 /// UDP 服务器
 /// </summary>
@@ -80,6 +78,15 @@ public class UDPServer
     /// </summary>
     public bool IsRunning { get { return isRunning; } }
 
+    /// <summary> UDP 服务器的错误代码 </summary>
+    public enum ErrorCode
+    {
+        Success = 0,
+        GetNoneAfterTimeout,
+        ResponseWrong,
+        NotRecvDataPackage,
+    }
+
     /// <summary>
     /// Construct a udp server with fixed port
     /// </summary>
@@ -132,8 +139,9 @@ public class UDPServer
         {
             var elapsed = DateTime.Now - startTime;
             isTimeout = elapsed >= TimeSpan.FromMilliseconds(timeout);
-            timeleft = TimeSpan.FromMilliseconds(timeout) - elapsed;
+            if (isTimeout) break;
 
+            timeleft = TimeSpan.FromMilliseconds(timeout) - elapsed;
             using (await udpData.AcquireWriteLockAsync(timeleft))
             {
                 if (udpData.ContainsKey(ipAddr) &&
@@ -150,11 +158,11 @@ public class UDPServer
         if (data is null)
         {
             logger.Trace("Get nothing even after time out");
-            return Optional<UDPData>.None;
+            return new(null);
         }
         else
         {
-            return Optional.Some((UDPData)data.DeepClone());
+            return new(data.DeepClone());
         }
     }
 
@@ -175,8 +183,9 @@ public class UDPServer
         {
             var elapsed = DateTime.Now - startTime;
             isTimeout = elapsed >= TimeSpan.FromMilliseconds(timeout);
-            timeleft = TimeSpan.FromMilliseconds(timeout) - elapsed;
+            if (isTimeout) break;
 
+            timeleft = TimeSpan.FromMilliseconds(timeout) - elapsed;
             using (await udpData.AcquireReadLockAsync(timeleft))
             {
                 if (udpData.ContainsKey(ipAddr) &&
@@ -193,11 +202,11 @@ public class UDPServer
         if (data is null)
         {
             logger.Trace("Get nothing even after time out");
-            return Optional<List<UDPData>>.None;
+            return new(null);
         }
         else
         {
-            return Optional.Some((List<UDPData>)data);
+            return new(data);
         }
     }
 
@@ -213,15 +222,15 @@ public class UDPServer
     {
         var data = await FindDataAsync(address, timeout);
         if (!data.HasValue)
-            throw new Exception("Get None even after time out!");
+            return new(new Exception("Get None even after time out!"));
 
         var recvData = data.Value;
         if (recvData.Address != address || (port > 0 && recvData.Port != port))
-            throw new Exception("Receive Data From Wrong Board!");
+            return new(new Exception("Receive Data From Wrong Board!"));
 
         var retPack = WebProtocol.RecvRespPackage.FromBytes(recvData.Data);
         if (!retPack.IsSuccessful)
-            throw new Exception("Not RecvDataPackage!", retPack.Error);
+            return new(new Exception("Not RecvDataPackage!", retPack.Error));
 
         return retPack.Value;
     }
@@ -233,20 +242,20 @@ public class UDPServer
     /// <param name="port">UDP 端口</param>
     /// <param name="timeout">超时时间范围</param>
     /// <returns>接收数据包</returns>
-    public async ValueTask<Result<WebProtocol.RecvDataPackage>> WaitForDataAsync
+    public async ValueTask<Result<RecvDataPackage>> WaitForDataAsync
         (string address, int port = -1, int timeout = 1000)
     {
         var data = await FindDataAsync(address, timeout);
         if (!data.HasValue)
-            throw new Exception("Get None even after time out!");
+            return new(new Exception("Get None even after time out!"));
 
         var recvData = data.Value;
         if (recvData.Address != address || (port >= 0 && recvData.Port != port))
-            throw new Exception("Receive Data From Wrong Board!");
+            return new(new Exception("Receive Data From Wrong Board!"));
 
         var retPack = WebProtocol.RecvDataPackage.FromBytes(recvData.Data);
         if (!retPack.IsSuccessful)
-            throw new Exception("Not RecvDataPackage!", retPack.Error);
+            return new(new Exception("Not RecvDataPackage!", retPack.Error));
 
         return retPack.Value;
     }
diff --git a/server/src/WebProtocol.cs b/server/src/WebProtocol.cs
index bbd71ba..88a99df 100644
--- a/server/src/WebProtocol.cs
+++ b/server/src/WebProtocol.cs
@@ -234,18 +234,18 @@ namespace WebProtocol
         {
             if (bytes.Length != 8)
             {
-                throw new ArgumentException(
+                return new(new ArgumentException(
                     "Bytes are not equal to 8 bytes.",
                     nameof(bytes)
-                );
+                ));
             }
 
             if (checkSign && bytes[0] != (byte)PackSign.SendAddr)
             {
-                throw new ArgumentException(
-                    "The sign of bytes is not SendAddr Package, but you can disable it by set checkSign false.",
-                    nameof(bytes)
-                );
+                return new(new ArgumentException(
+                            "The sign of bytes is not SendAddr Package, but you can disable it by set checkSign false.",
+                            nameof(bytes)
+                            ));
             }
 
             var address = Common.Number.BytesToNumber(bytes[4..]).Value;
@@ -377,10 +377,10 @@ namespace WebProtocol
         public static Result<RecvDataPackage> FromBytes(byte[] bytes)
         {
             if (bytes[0] != (byte)PackSign.RecvData)
-                throw new ArgumentException(
+                return new(new ArgumentException(
                     $"The sign of bytes is not RecvData Package, Sign: 0x{BitConverter.ToString([bytes[0]])}",
                     nameof(bytes)
-                );
+                ));
             return new RecvDataPackage(bytes[1], bytes[2], bytes[4..]);
         }
 
@@ -480,10 +480,10 @@ namespace WebProtocol
         public static Result<RecvRespPackage> FromBytes(byte[] bytes)
         {
             if (bytes[0] != (byte)PackSign.RecvResp)
-                throw new ArgumentException(
+                return new(new ArgumentException(
                     $"The sign of bytes is not RecvResp Package, Sign: 0x{BitConverter.ToString([bytes[0]])}",
                     nameof(bytes)
-                );
+                ));
             return new RecvRespPackage(bytes[1], bytes[2]);
         }