You need to submit your China visa application to Chinese embassy or consylate according to the location you reside.
The requirements for a tourist visa to China are as follows:
1. your passport valid for more than 6 months with enough blank visa pages;
2. one recent passport sized photo;
3. an completely filled China visa application form;
4. Entry record/residence permit to Japan and its photocopy.
5. hotel reservation and return ticket,etc.