diff --git a/v2rayN/ServiceLib/Handler/ConfigHandler.cs b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
index eab544da..da7258a7 100644
--- a/v2rayN/ServiceLib/Handler/ConfigHandler.cs
+++ b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
@@ -77,10 +77,11 @@ public static class ConfigHandler
             Tti = 50,
             UplinkCapacity = 12,
             DownlinkCapacity = 100,
-            ReadBufferSize = 2,
-            WriteBufferSize = 2,
-            Congestion = false
+            CwndMultiplier = 1,
+            MaxSendingWindow = 2 * 1024 * 1024,
         };
+        config.KcpItem.CwndMultiplier = config.KcpItem.CwndMultiplier <= 0 ? 1 : config.KcpItem.CwndMultiplier;
+        config.KcpItem.MaxSendingWindow = config.KcpItem.MaxSendingWindow <= 0 ? (2 * 1024 * 1024) : config.KcpItem.MaxSendingWindow;
         config.GrpcItem ??= new GrpcItem
         {
             IdleTimeout = 60,
diff --git a/v2rayN/ServiceLib/Models/ConfigItems.cs b/v2rayN/ServiceLib/Models/ConfigItems.cs
index d47d2876..1988d3b7 100644
--- a/v2rayN/ServiceLib/Models/ConfigItems.cs
+++ b/v2rayN/ServiceLib/Models/ConfigItems.cs
@@ -49,11 +49,9 @@ public class KcpItem
 
     public int DownlinkCapacity { get; set; }
 
-    public bool Congestion { get; set; }
+    public int CwndMultiplier { get; set; }
 
-    public int ReadBufferSize { get; set; }
-
-    public int WriteBufferSize { get; set; }
+    public int MaxSendingWindow { get; set; }
 }
 
 [Serializable]
diff --git a/v2rayN/ServiceLib/Models/V2rayConfig.cs b/v2rayN/ServiceLib/Models/V2rayConfig.cs
index a5ac2e24..909a37fb 100644
--- a/v2rayN/ServiceLib/Models/V2rayConfig.cs
+++ b/v2rayN/ServiceLib/Models/V2rayConfig.cs
@@ -409,11 +409,9 @@ public class KcpSettings4Ray
 
     public int downlinkCapacity { get; set; }
 
-    public bool congestion { get; set; }
+    public int cwndMultiplier { get; set; }
 
-    public int readBufferSize { get; set; }
-
-    public int writeBufferSize { get; set; }
+    public int maxSendingWindow { get; set; }
 }
 
 public class WsSettings4Ray
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
index a0d4099f..d40ed8a3 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
@@ -477,9 +477,8 @@ public partial class CoreConfigV2rayService
                     kcpSettings.uplinkCapacity = _config.KcpItem.UplinkCapacity;
                     kcpSettings.downlinkCapacity = _config.KcpItem.DownlinkCapacity;
 
-                    kcpSettings.congestion = _config.KcpItem.Congestion;
-                    kcpSettings.readBufferSize = _config.KcpItem.ReadBufferSize;
-                    kcpSettings.writeBufferSize = _config.KcpItem.WriteBufferSize;
+                    kcpSettings.cwndMultiplier = _config.KcpItem.CwndMultiplier;
+                    kcpSettings.maxSendingWindow = _config.KcpItem.MaxSendingWindow;
                     var kcpFinalmask = new Finalmask4Ray();
                     if (Global.KcpHeaderMaskMap.TryGetValue(headerType, out var header))
                     {