diff --git a/handler/tool.go b/handler/tool.go
index bd382c3..21d56dd 100644
--- a/handler/tool.go
+++ b/handler/tool.go
@@ -214,6 +214,7 @@ func subscribeAndHandleMessagesV3(ws *websocket.Conn, device_id int) {
 	//定时器，发送计数器
 	t_count := 0
 	t := 0
+	//计算帧率
 	for {
 		//从service获取当前帧
 		img, c := service.GetDeviceCurrentFrameV3(device_id)
@@ -243,11 +244,11 @@ func subscribeAndHandleMessagesV3(ws *websocket.Conn, device_id int) {
 					break
 				}
 				c = count
+				t++
 				err5 := img.Close()
 				if err5 != nil {
 					log.Printf("img close err:%v", err)
 				} else {
-					t++
 					if t%10 == 0 {
 						log.Printf("device:%d send frame count:%d,img is closed", device_id, c)
 					}