Im Cristina, residing here in Dubai, my 2 years visa here is already finish and hold tourist visa here in Dubai, What is the requirement on how to get a tourist visa in China?

If now you hold a tourist visa in Dubai, it is impossible for you to get a China tourist visa in Dubai. For non-UAE applicants, the UAE resident visa valid for more than 6 months is required. You can go to China Consulate in Dubai to try your luck, but I guess the chance of getting a China visa is slim.