How to add so many static routes automatically?

[aspire]

Version  1.2.3-RC1 built on Wed Apr 22 15:36:34 EDT 2009
I have WAN1 and WAN2, where WAN2 is on CERNET with the IP blocks on
https://www.nic.edu.cn/RS/ipstat/internalip/real200905.s.html
All the subnets in CERNET will route to WAN2's gateway, How to add so many static routes? If by WebGUI, one by one, it seems too bad.
Thanks in advance