Hi,I have Pakistani passport with graduate skilled visa

You need to prepare copy of passport, the application form, a passport-style photo, hotel reservation, flight itinerary, travel plan and proof of financial support. Next, submit two separate applications to the embassy of China.
If the embassy deals the applications on its own, it may take 4 or 5 working days. But if the applications are transferred to HK immigration department and Macau Public Security Police Office, it may take 4-6 weeks, and 3 weeks respectively.