Hi, i am an Australian living in Pakistan and I want to visit Hui Zhou for 3 days.

Yes, you need a visa for that. If you go there for sightseeing purpose, you should first prepare passport and copy of its data page, a completed application form, a passport-style photo, hotel reservation and transportation arrangement, as well as residence permit in Pakistan. Next, submit the application to China embassy. Usually, it takes 4 working days to get the result after submitting the application.