Not closed. Generally, university libraries are only closed on national holidays, and the opening hours will be adjusted according to the actual situation of the school in winter and summer vacations, and they will not be closed (except in special circumstances). However, some specific businesses may be adjusted during the winter and summer vacations, such as fewer personnel arrangements and relatively normal business hours. You can pay attention to the homepage of your school library, WeChat, Weibo and other WeChat official account, and pay attention to the changes of opening hours and service hours.