Ms.roselle, if you want to apply for China tourist visa in China, you should get a China visa to enter China, such as tourist visa, study visa, work visa, etc, you can change other types of visa into Tourist visa, or apply for extension of stay duration for your tourist visa.

The requirements are:
1. your valid passport
2. one completed visa application form affixed with one recent passport photo
3. copy of your present visa
4. the certificate prove that you need to stay longer in China