How to travel to Guilin University other than bus?how much its fare?

Do you refer to GL University of Technology? If so, as I know, there are several capuses, which one do you mean?
Well, apart from bus, you can take a taxi, the fare is different to these capuses.
Pingfeng Campus, the fare is about CNY80.
Yanshan Campus, the fare is about CNY100.

If we are taking the bus from Liangjiang airport to downtown, the to the Technology university.How much the fare is? Bus or taxi?

Yes, you can take airport shuttle bus to get to civil aviation building first (CNY20).
Then it's suggested to take a taxi to get to the campus directly.
To Pingfeng Campus: The cab fare is about CNY 20.
To Yanshan Campus: The cab fare is about CNY 60 to 70. Or you can take public bus no. 97 to get off at Yanshan Campus directly.
You can choose the way you like. :-)