Refers to a librarian or a person who has obtained a professional degree in library science. It is a professional who is responsible for the operation of the library, including a whole set of processes such as purchasing, processing, description, circulation (borrowing), analysis report and service for readers. School librarians also undertake the educational function for readers, guide readers to find and use academic literature resources, and guide readers to study or study. Therefore, university librarians are usually awarded the title of teacher or corresponding treatment. However, in general understanding, librarians are often misunderstood as librarians or mistakenly believe that their job is only to borrow and return books. In fact, librarians usually refer to non-professionals who are responsible for the circulation of books and the sorting and auxiliary processing of books in the library. There is a great difference between librarians and librarians in their work.