I would like to know how to go Mulan Moutain from Hust, Wuhan.

Well, you are suggested to take a taxi to the Long-distance Bus Station in 91 Yanjiang Avenue, which takes about 30 minutes and CNY40-50.
After getting there, you can take a tourist bus 1 to the mountain. By the way, the tourist is available from 8:00 to 9:00, and takes CNY16.

Thanks