You need to apply for the China L visa from Chinese Visa Application Service Center. The detail information about the center is listed above, you need to make an appointment first.
The requirements are as follows:
1. Original passport remaining to be valid for at least 6 months from the date of application and with sufficient blank visa pages.
2. One completed Visa Application Form with a recently-taken passport photo.
3. return ticket and hotel reservation from China.
4. valid visa ot work permit in Indonesia.