If you're asking about the one on Jinxiu Road and Qiancheng Road, it's free and air-conditioned. If you want to take a seat, you'll go in the morning, but it's more difficult to go in the afternoon. The food in the canteen can be similar to that in ordinary university canteens, but the price is slightly higher and the quality is better. Please refer to the homepage

/PDTSG _ website/html/Defaultsite/portal/index/index.htm

for the specific floor and opening hours. You can take Line 6 to Gaoke West Road Station and change to Line 7 to Jinxiu Road Station, and you can't get there for 1 minutes!