diff --git a/Netch/Forms/MainForm.Control.cs b/Netch/Forms/MainForm.Control.cs
index f64b0bba..2f47f202 100644
--- a/Netch/Forms/MainForm.Control.cs
+++ b/Netch/Forms/MainForm.Control.cs
@@ -1,5 +1,6 @@
 using System;
 using System.IO;
+using System.Numerics;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Windows.Forms;
@@ -93,11 +94,11 @@ namespace Netch.Forms
             }
         }
 
-        public void OnBandwidthUpdated(long download)
+        public void OnBandwidthUpdated(ulong download)
         {
             if (InvokeRequired)
             {
-                BeginInvoke(new Action<long>(OnBandwidthUpdated), download);
+                BeginInvoke(new Action<ulong>(OnBandwidthUpdated), download);
                 return;
             }
 
@@ -117,44 +118,14 @@ namespace Netch.Forms
             }
         }
 
-        public void OnBandwidthUpdated(long upload, long download)
-        {
-            if (InvokeRequired)
-            {
-                BeginInvoke(new Action<long, long>(OnBandwidthUpdated), upload, download);
-                return;
-            }
-
-            try
-            {
-                if (upload < 1 || download < 1)
-                {
-                    return;
-                }
-
-                UsedBandwidthLabel.Text =
-                    $"{i18N.Translate("Used", ": ")}{Bandwidth.Compute(upload + download)}";
-                UploadSpeedLabel.Text = $"↑: {Bandwidth.Compute(upload - LastUploadBandwidth)}/s";
-                DownloadSpeedLabel.Text = $"↓: {Bandwidth.Compute(download - LastDownloadBandwidth)}/s";
-
-                LastUploadBandwidth = upload;
-                LastDownloadBandwidth = download;
-                Refresh();
-            }
-            catch
-            {
-                // ignored
-            }
-        }
-
         /// <summary>
         ///     上一次上传的流量
         /// </summary>
-        public long LastUploadBandwidth;
+        public ulong LastUploadBandwidth;
 
         /// <summary>
         ///     上一次下载的流量
         /// </summary>
-        public long LastDownloadBandwidth;
+        public ulong LastDownloadBandwidth;
     }
 }
\ No newline at end of file
diff --git a/Netch/Utils/Bandwidth.cs b/Netch/Utils/Bandwidth.cs
index 6c809080..20bc8d1e 100644
--- a/Netch/Utils/Bandwidth.cs
+++ b/Netch/Utils/Bandwidth.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
+using System.Numerics;
 using System.Threading.Tasks;
 using Microsoft.Diagnostics.Tracing.Parsers;
 using Microsoft.Diagnostics.Tracing.Session;
@@ -13,7 +14,7 @@ namespace Netch.Utils
 {
     public static class Bandwidth
     {
-        public static int received;
+        public static ulong received;
         public static TraceEventSession tSession;
 
         /// <summary>
@@ -21,7 +22,7 @@ namespace Netch.Utils
         /// </summary>
         /// <param name="bandwidth">流量</param>
         /// <returns>带单位的流量字符串</returns>
-        public static string Compute(long size)
+        public static string Compute(ulong size)
         {
             var mStrSize = @"0";
             const double step = 1024.00;
@@ -96,7 +97,7 @@ namespace Netch.Utils
                     if (processList.Contains(data.ProcessID))
                     {
                         lock (counterLock)
-                            received += data.size;
+                            received += ulong.Parse(data.size.ToString());
 
                         // Debug.WriteLine($"TcpIpRecv: {ToByteSize(data.size)}");
                     }
@@ -106,7 +107,7 @@ namespace Netch.Utils
                     if (processList.Contains(data.ProcessID))
                     {
                         lock (counterLock)
-                            received += data.size;
+                            received += ulong.Parse(data.size.ToString());
 
                         // Debug.WriteLine($"UdpIpRecv: {ToByteSize(data.size)}");
                     }