diff --git a/sysmodule/mongomodule/mongomodule.go b/sysmodule/mongomodule/mongomodule.go
index c671c07..44d9b8f 100644
--- a/sysmodule/mongomodule/mongomodule.go
+++ b/sysmodule/mongomodule/mongomodule.go
@@ -48,6 +48,7 @@ func dialWithTimeout(url string, sessionNum uint32, dialTimeout time.Duration, t
 	if err != nil {
 		return nil, err
 	}
+	s.SetMode(mgo.Monotonic,true)
 	s.SetSyncTimeout(timeout)
 	s.SetSocketTimeout(timeout)