i want to travel in one day to mt. emi shan and leshan.

You are suggested to take long-distance bus at Chengdu North Bus Station, and get to Leshan first. The ticket fare is about CNY 45 per adult. It will take around 2 hours on the way.
After visiting, you are suggested to hire a private car to Mt. Emei. The fare is about CNY 300 to 400.
It's not easy for you to get a taxi because of the long-distance. The easier way is to hire a private car.
According your travel plan, the time is tight. You need to choose the most convenient transportation. :-)

thank you for your answer. so i take a private car from leshan? can you give me a name of a company to rent such a car?