Abstract: O2O service is a new service mode. Some university libraries introduce O2O service according to their own actual situation, and have achieved certain results through practical exploration. Among them, Xidian University library is one of the earliest university libraries to realize O2O service. Based on the three-year user data of O2O service platform of Xidian University, this paper makes statistical analysis and comparison on the use data of each functional module, and puts forwards suggestions and solutions according to the actual situation of universities, so as to provide reference for the innovation and development of other university libraries.