diff --git a/worker/nowcar/nowcar.go b/worker/nowcar/nowcar.go
index 91a965d..b8e88a5 100644
--- a/worker/nowcar/nowcar.go
+++ b/worker/nowcar/nowcar.go
@@ -89,7 +89,7 @@ func getInfo(devId string) ([]string, error) {
 
 			m2.EndTime = time.Now().Unix()
 			m2.Amount = goutil.If(m2.EndTime-m2.StartTime <= 600, 660,
-				60*(m2.EndTime-m2.StartTime-600)+660)
+				(m2.EndTime-m2.StartTime-600)+660)
 			err = dao.NewNowCarDao().Update(m2)
 			if err != nil {
 				log.Errorf("db error :%s", err.Error())