diff --git a/action/action.go b/action/action.go
index 6fc3e8e..c692d29 100644
--- a/action/action.go
+++ b/action/action.go
@@ -3,6 +3,7 @@ package action
 import (
 	"encoding/json"
 	"fmt"
+	"sync"
 
 	"git.lxtend.com/qqbot/message"
 	"git.lxtend.com/qqbot/model"
@@ -16,6 +17,7 @@ var ActionManager = actionManager{}
 
 type actionManager struct {
 	botConn *websocket.Conn
+	sendMtx sync.Mutex
 }
 
 func (am *actionManager) Started() bool {
@@ -31,6 +33,8 @@ func (am *actionManager) SendAction(action string) error {
 }
 
 func (am *actionManager) SendMsg(reply model.Reply) error {
+	am.sendMtx.Lock()
+	defer am.sendMtx.Unlock()
 	if reply.ReferOriginMsg {
 		replyMsg := message.ReplyMessage{
 			Type: "reply",