Is it possible to apply with No hotel reservation, No invitation letter?

Hello, could you tell me how I can apply and what I should bring to Embassy?
I am Japanese passport holder, and I am currently issued B-Permit Visa in Switzerland.
I would like to stay in China for 3 weeks, staying with my girlfriend's house. and he is not Chinese nationality and its citizen either.
Therefore, i don't have Hotel reservation. Is it possible to apply Tourist Visa (L-Visa) with my bank statement which shows more than 100$*21days, Round trip flight-ticket with both A and B Application Forms? I am planning to visit there this winter.