Tsinghua University's work permit number and password must be available, and you must show your work permit when you borrow books from the library. Tsinghua University electronic identity refers to personal ID number+account number+password. Personal ID number includes student number, work permit number, campus card number and other personnel numbers, and account number includes network connection account number and email account number. You can access and use the campus network information service resources recognized by the school, such as campus network, e-mail, information portal, online school, library, etc. by logging in with Tsinghua University electronic identity.