Hello, there are Zhi Bo Building (Seven Religions) and Huizhi Building (Nine Religions). The second floor is closed at night 10, and no permit is required for entry and exit. Jiao Tong University Library and Teaching Building No.3 are not closed during the winter vacation, so you can study by yourself. I suggest you go to the library. The library has heating. It's so cold now that it will be more comfortable to go to the library.