Abstract: With the improvement of people's material life, the demands for library information resource has increased rapidly. All along, library as an important place for people to read, is loved by the majority of readers. In recent years, with the increasing open awareness, reading community is popular, and people in the community can enjoy all the library reading service. Reading community has got rapid development, at the same time reader data of reading community has also got a lot of accumulation. This paper used the data mining technology to excavate the historical data of reading community, and constructed the reading community model for readers of library based on data mining, to lay the foundation for the improvement of service quality of library.