diff --git a/service/singleton/servicesentinel.go b/service/singleton/servicesentinel.go
index 5f1daf1..d2636d2 100644
--- a/service/singleton/servicesentinel.go
+++ b/service/singleton/servicesentinel.go
@@ -427,6 +427,7 @@ func (ss *ServiceSentinel) worker() {
 			ts.ping = (ts.ping*float32(ts.count-1) + mh.Delay) / float32(ts.count)
 			if ts.count == Conf.AvgPingCount {
 				ts.count = 0
+				ts.ping = mh.Delay
 				if err := DB.Create(&model.ServiceHistory{
 					ServiceID: mh.GetId(),
 					AvgDelay:  ts.ping,