Problem solved.
IT IS the internet problem.
Eventhough it failed when firstly install forge server/client, a folder named 'libraries' created in the target folder. Specifically, \libraries\net\minecraft\server, and it's empty.
Download official file server.jar from https://www.minecraft.net/download/server or other sources and put it in '\libraries\net\minecraft\server', rename it as 'server-x.xx.x.jar’ (for me it's server-1.18.2.jar).Restart install and everthing goes fine.
if it stucked at downloading mojmaps, just wait or try VPN.