At the school headquarters, go straight into the school gate, go up from the left after you come to a stone tablet that says "Central South University", turn left after passing the library, go to the south building of the science and technology building, go straight on the road between the science and technology building and the sublimation building, and walk to the third canteen. Liyantang is on the third floor of the third canteen.

I don't know if I have made it clear, I hope it will help you. When you enter the school and ask for directions, I will tell you what I know enthusiastically.