diff --git a/transport/internet/kcp/connection.go b/transport/internet/kcp/connection.go
index a6ccd8ca..727537f9 100644
--- a/transport/internet/kcp/connection.go
+++ b/transport/internet/kcp/connection.go
@@ -414,6 +414,7 @@ func (this *Connection) Input(data []byte) int {
 			}
 			this.sendingWorker.ProcessReceivingNext(seg.ReceivinNext)
 			this.receivingWorker.ProcessSendingNext(seg.SendingNext)
+			seg.Release()
 		default:
 		}
 	}
diff --git a/transport/internet/kcp/sending.go b/transport/internet/kcp/sending.go
index a39af80d..63fdf325 100644
--- a/transport/internet/kcp/sending.go
+++ b/transport/internet/kcp/sending.go
@@ -292,6 +292,8 @@ func (this *SendingWorker) ProcessAck(number uint32) {
 }
 
 func (this *SendingWorker) ProcessSegment(current uint32, seg *AckSegment) {
+	defer seg.Release()
+
 	this.Lock()
 	defer this.Unlock()