diff --git a/handler/tool.go b/handler/tool.go
index 868555f..ea048a2 100644
--- a/handler/tool.go
+++ b/handler/tool.go
@@ -195,11 +195,13 @@ func subscribeAndHandleMessagesV3(ws *websocket.Conn, deviceId int) {
 	count := 0
 	//定时器，发送计数器
 	tCount := 0
+	var buf []byte
 	//计算帧率
 	for {
 		//从service获取当前帧
-		buf, c := service.GetDeviceCurrentFrameV4(deviceId, count)
+		newBuf, c := service.GetDeviceCurrentFrameV4(deviceId, count)
 		if c != count {
+			buf = newBuf
 			count = c
 			err2 := ws.WriteMessage(websocket.BinaryMessage, buf)
 			if err2 != nil {
@@ -221,7 +223,6 @@ func subscribeAndHandleMessagesV3(ws *websocket.Conn, deviceId int) {
 				}
 			}
 		}
-		buf = nil
 		time.Sleep(100 * time.Millisecond)
 		tCount++
 	}