Abstract: In recent years,the construction of China's public cultural service system has made remarkable progress,in the aspects of equalization,standardization,digitization and socialization,library has always led the development of the public cultural services.Summarized the practice status of public cultural servicesystemfour modernizations,analyzed innovation and result of public library in four modernizations,including the standard system of library has taken shape,co-building library increasingly,be burdened with a lot in public digital culture project,etc.Put forword that public library focus on improve the standard system,fill in equalization short,multipleparticipation,integration of scienceand technology.

Key words: public cultural servicesystem；public library；equalization；standardization；digitization；socialization