Fourth floor. Fudan University Library is the national key protection unit of ancient books, and the liberal arts library is on the fourth floor. Fudan University Library has 13 stacks, 4 lending rooms, 3 book circulation offices, 20 reading rooms and 3 study rooms for students, with a total of 4,076 reading seats. It is open every week for 105 hours and receives more than 7,000 readers every day.