All trains are now only Leshan out. how can I do to get to the Buddha?

Are you starting from Chengdu? If yes, there are many bullet train tickets left these days. After getting to the train station, take local city bus no. 3 to the Buddha directly and buy ticket onboard. Then walk to the scenic area. You can book the ticket through bookingtravelchinaguide.com.

Or, you can take a bus there from Xinnanmen Bus Station. The buses are available from 6:45 to 18:10, and the fare is CNY 45. You can buy the tickets on the spot upon arrival. Don't worry! :)