I found that vps can't log in, I need a root password, but I can't find it, thank you

fixed

When if you get any problem in later then please take a look at China related or Advanced mode. It's recommended connect through over Hong Kong or Taiwan servers for bypass the Great Firewall then you can try to combinate with Mudfish DNS Client but as you know we have barely methods to connect to China as poor nodes so if you doubt the Great Firewall I think there's no many options for stabilize your RTT.