diff --git a/client.go b/client.go
index 434e49a..9507ee6 100644
--- a/client.go
+++ b/client.go
@@ -1,4 +1,4 @@
-package main
+package pingtunnel
 
 import (
 	"github.com/esrrhs/gohome/common"
diff --git a/main.go b/cmd/main.go
similarity index 94%
rename from main.go
rename to cmd/main.go
index 96f623a..cb83373 100644
--- a/main.go
+++ b/cmd/main.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"github.com/esrrhs/gohome/common"
 	"github.com/esrrhs/gohome/loggo"
+	"github.com/esrrhs/pingtunnel"
 	"net"
 	"net/http"
 	_ "net/http/pprof"
@@ -166,8 +167,8 @@ func main() {
 			*tcpmode = 1
 		}
 	}
-	if *tcpmode_maxwin*10 > FRAME_MAX_ID {
-		fmt.Println("set tcp win to big, max = " + strconv.Itoa(FRAME_MAX_ID/10))
+	if *tcpmode_maxwin*10 > pingtunnel.FRAME_MAX_ID {
+		fmt.Println("set tcp win to big, max = " + strconv.Itoa(pingtunnel.FRAME_MAX_ID/10))
 		return
 	}
 
@@ -186,7 +187,7 @@ func main() {
 	loggo.Info("key %d", *key)
 
 	if *t == "server" {
-		s, err := NewServer(*key, *maxconn, *max_process_thread, *max_process_buffer, *conntt)
+		s, err := pingtunnel.NewServer(*key, *maxconn, *max_process_thread, *max_process_buffer, *conntt)
 		if err != nil {
 			loggo.Error("ERROR: %s", err.Error())
 			return
@@ -213,7 +214,7 @@ func main() {
 		}
 
 		if len(*s5filter) > 0 {
-			err := LoadGeoDB(*s5ftfile)
+			err := pingtunnel.LoadGeoDB(*s5ftfile)
 			if err != nil {
 				loggo.Error("Load Sock5 ip file ERROR: %s", err.Error())
 				return
@@ -229,7 +230,7 @@ func main() {
 				return false
 			}
 
-			ret, err := GetCountryIsoCode(taddr.IP.String())
+			ret, err := pingtunnel.GetCountryIsoCode(taddr.IP.String())
 			if err != nil {
 				return false
 			}
@@ -239,7 +240,7 @@ func main() {
 			return ret != *s5filter
 		}
 
-		c, err := NewClient(*listen, *server, *target, *timeout, *key,
+		c, err := pingtunnel.NewClient(*listen, *server, *target, *timeout, *key,
 			*tcpmode, *tcpmode_buffersize, *tcpmode_maxwin, *tcpmode_resend_timems, *tcpmode_compress,
 			*tcpmode_stat, *open_sock5, *maxconn, &filter)
 		if err != nil {
diff --git a/country.go b/country.go
index 752b373..8a43c87 100644
--- a/country.go
+++ b/country.go
@@ -1,4 +1,4 @@
-package main
+package pingtunnel
 
 import (
 	"errors"
diff --git a/country_test.go b/country_test.go
index f70496e..e376d4d 100644
--- a/country_test.go
+++ b/country_test.go
@@ -1,4 +1,4 @@
-package main
+package pingtunnel
 
 import (
 	"fmt"
diff --git a/go.mod b/go.mod
index 2830d07..c19bc8b 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module github.com/esrrhs/pingtunnul
+module github.com/esrrhs/pingtunnel
 
 go 1.18
 
diff --git a/msg.pb.go b/msg.pb.go
index 181635f..1be852e 100644
--- a/msg.pb.go
+++ b/msg.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: msg.proto
 
-package main
+package pingtunnel
 
 import (
 	fmt "fmt"
diff --git a/msg.proto b/msg.proto
index 52f4530..805dbef 100644
--- a/msg.proto
+++ b/msg.proto
@@ -1,5 +1,5 @@
 syntax = "proto3";
-option go_package = "main";
+option go_package = "pingtunnel";
 
 message MyMsg {
   enum TYPE {
diff --git a/pingtunnel.go b/pingtunnel.go
index ab6a1d2..73d046d 100644
--- a/pingtunnel.go
+++ b/pingtunnel.go
@@ -1,4 +1,4 @@
-package main
+package pingtunnel
 
 import (
 	"encoding/binary"
diff --git a/pingtunnel_test.go b/pingtunnel_test.go
index ad2ff3f..31d0da0 100644
--- a/pingtunnel_test.go
+++ b/pingtunnel_test.go
@@ -1,4 +1,4 @@
-package main
+package pingtunnel
 
 import (
 	"fmt"
diff --git a/server.go b/server.go
index 252c0f5..38e21da 100644
--- a/server.go
+++ b/server.go
@@ -1,4 +1,4 @@
-package main
+package pingtunnel
 
 import (
 	"github.com/esrrhs/gohome/common"