I am Pakistani national working in China and have (Residence permit for Foreigner).

Umer, yes, you can apply for it from China.
You have at least 50% chance to get it.
The required documents include your passport and copy of its data page, the visa application form, your residence permit in China, a passport-style photo, proof of your financial support, an invitation letter from your brother as well as other documents the consular officers consider necessary.