thanks everyone and great job maxut,
My problem get fix. I'm not sure what it should be or this is the rigth way to config alias network.
I go to /etc/sysconfig/network file and found that it has one line
GATEWAY=202.183.x.97
I guess may be redhat define gateway 3 times(for my case)
in ifcfg-eth0 =>GATEWAY=202.183.x.97
in ifcfg-eth0:1 =>GATEWAY=192.168.1.1
and in /etc/sysconfig/network =>GATEWAY=202.183.x.97
so it double default gw in my routing table
after I delete one in network file and reboot machine my routing is look OK and no manually delete anymore.