Abstract: Based on the survey data of ＂the Document Resources Construction and Benefit of Nankai University Library＂, this paper respectively refines the impact factor of utilization ratio of books in different readers groups and determines its weighing values. According to borrow status, reading habits and demand characteristics of readers groups, it puts forward the service strategy in order to improve the utilization ratio of library books.

Key words: university library; utilization ratio of books; factor analysis; weight calculation