Books and periodicals are classified according to Library Classification of China Academy of Sciences (referred to as Ketu Law). Stacks, periodicals and reading rooms all adopt classified shelving method, which is convenient for readers to find documents from the knowledge system of books and periodicals, while Chinese current periodicals adopt classified fixed shelving method, which is convenient for readers to consult; The current foreign periodicals adopt national classification and shelving; The retrieved publications are arranged according to the frequency of use. Readers' services include borrowing, reading, subject novelty retrieval, information consulting service, photocopying service, computer retrieval service and interlibrary loan. With an average of 300,000 books and 600,000 readers, it is one of the longest university libraries in China with a weekly opening time of 1.0 1.5 hours.