How can i get tourist visa of mexico ?

Harry, you go there for sightseeing purpose, right? If yes, you need to prepare those documents including the completed application form affixed with a passport-style photo, your passport and copy of its data page, your residence permit in PRC, proof of your financial support, and your travel itinerary to Mexico. Maybe round trip air tickets and hotel reservation are needed, too.
Afterwards, submit your application to the embassy of Mexico to apply for it.