The invention relates to a method for calculating an influence factor of borrowable books in a library. The method can solve a book circulation data basis problem and a guidance reader reading reference basis problem in library management, and comprises that a management system of the library calculates the data of a current month and substitutes the data into a formula described in the specification so as to obtain an influence factor If of the borrowable books of the library in the current month. The method is associated with various library management systems, is used for extracting and recording database data, is novel and unique, and reasonable in computing method, has multiple purposes including statistic, calculation and function development, can be used for big data statistic and network development, obtaining the read service life of new books, and reader hot reading statistic, and is an innovation in the reference basis computing method in book management, publishing, reading, and purchase.