I don't know which campus you are asking. Sun Yat-sen University has four campuses, all of which are open to the public. Just buy a meal ticket.

As for accommodation, Dongyuan Hotel is located in the east campus, but the price is relatively high, with students from our school 150 and students from other schools 180. But there is a natural village outside the school-Beigang Village, which can provide accommodation ranging from 35 yuan to 90 yuan. There is a guest house in Zhuhai Campus, which goes to 80 yuan every night. There is a guest house in the south campus, every night 120. North campus unknown