diff --git a/cmd/main.go b/cmd/main.go
index fddb10a..fb4ad0a 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -42,7 +42,7 @@ Usage:
               Tcp send and receive buffer size, default 1MB
 
     -tcp_mw   tcp的最大窗口，默认10000
-              The maximum window of tcp, the default is 100
+              The maximum window of tcp, the default is 10000
 
     -tcp_rst  tcp的超时发送时间，默认400ms
               Tcp timeout resend time, default 400ms
@@ -58,7 +58,7 @@ func main() {
 	key := flag.Int("key", 0, "key")
 	tcpmode := flag.Int("tcp", 0, "tcp mode")
 	tcpmode_buffersize := flag.Int("tcp_bs", 1024*1024, "tcp mode buffer size")
-	tcpmode_maxwin := flag.Int("tcp_mw", 100, "tcp mode max win")
+	tcpmode_maxwin := flag.Int("tcp_mw", 10000, "tcp mode max win")
 	tcpmode_resend_timems := flag.Int("tcp_rst", 400, "tcp mode resend time ms")
 	flag.Usage = func() {
 		fmt.Printf(usage)