diff --git a/transport/internet/kcp/connection.go b/transport/internet/kcp/connection.go
index 46a2578f..e756802c 100644
--- a/transport/internet/kcp/connection.go
+++ b/transport/internet/kcp/connection.go
@@ -68,7 +68,6 @@ func NewConnection(conv uint16, writerCloser io.WriteCloser, local *net.UDPAddr,
 		Writer:        writerCloser,
 	}
 	conn.kcp = NewKCP(conv, authWriter)
-	conn.kcp.NoDelay(effectiveConfig.Tti, 2, effectiveConfig.Congestion)
 	conn.kcp.current = conn.Elapsed()
 
 	go conn.updateTask()
diff --git a/transport/internet/kcp/kcp.go b/transport/internet/kcp/kcp.go
index 8722851e..2b85d475 100644
--- a/transport/internet/kcp/kcp.go
+++ b/transport/internet/kcp/kcp.go
@@ -44,7 +44,7 @@ type KCP struct {
 	snd_buf         *SendingWindow
 	receivingWorker *ReceivingWorker
 
-	fastresend        int32
+	fastresend        uint32
 	congestionControl bool
 	output            *BufferedSegmentWriter
 }
@@ -65,6 +65,8 @@ func NewKCP(conv uint16, output *AuthenticationWriter) *KCP {
 	kcp.snd_buf = NewSendingWindow(kcp, effectiveConfig.GetSendingWindowSize())
 	kcp.cwnd = kcp.snd_wnd
 	kcp.receivingWorker = NewReceivingWorker(kcp)
+	kcp.fastresend = 2
+	kcp.congestionControl = effectiveConfig.Congestion
 	return kcp
 }
 
@@ -356,22 +358,6 @@ func (kcp *KCP) Update(current uint32) {
 	kcp.flush()
 }
 
-// NoDelay options
-// fastest: ikcp_nodelay(kcp, 1, 20, 2, 1)
-// nodelay: 0:disable(default), 1:enable
-// interval: internal update timer interval in millisec, default is 100ms
-// resend: 0:disable fast resend(default), 1:enable fast resend
-// nc: 0:normal congestion control(default), 1:disable congestion control
-func (kcp *KCP) NoDelay(interval uint32, resend int, congestionControl bool) int {
-	kcp.interval = interval
-
-	if resend >= 0 {
-		kcp.fastresend = int32(resend)
-	}
-	kcp.congestionControl = congestionControl
-	return 0
-}
-
 // WaitSnd gets how many packet is waiting to be sent
 func (kcp *KCP) WaitSnd() uint32 {
 	return uint32(kcp.snd_buf.Len()) + kcp.snd_queue.Len()