Does you have any information for the bus schedule and fare from Mohanzhen to Chengdu?

You mean Mohanzhen in Yunnan Xishuangbanna? It’s too far between the two places that there is no direct bus available.
If you really want to go by bus, here is the way:
You’d first take bus from Mohan to Mengla (buses are available from 07:00 to 19:00, and cost CNY17). After that, take bus to Kunming. 3 buses are available everyday. They running at 09:00, 18:00 and 20:00, and the ticket fare is CNY252. It would take about 6 hours. Then From Kunming North Bus Station you can take bus to CD. There is only one bus available at 13:00 every day. The ticket fare is CNY280 and it takes about 14 hours to reach. Trains from Kunming to CD are available also. It would take about 18-24 hours to reach. The ticket price is CNY398.5 for soft sleeper, and CNY148.5 for hard sleeper.
For the back journey, you can just take the same way.