You shoud go to the China Embassy in Austria to apply for a Tourist Visa (L Visa). if you can't do this, you can ask someone else to act this on your behalf. Please prepare the following requirments:
1. Your original passport with at least 6 months validity and 1 blank visa pages
2. One completed Visa Application Form attached with one recent passport photo
3. round air ticket,
4. invitation letter from your girlfriend, the copy of her passport or ID