According to the dynamic needs of readers, scientific and reasonable distribution and control of readers' authority can effectively improve the rate of collection guarantee, resource utilization and book circulation of Smart Library. It is an important way to relieve the contradiction between library and readers' supply and demand, improving service effectiveness and improve readers' satisfaction. Through the induction and analysis of the current situation of library reader authority setting, this paper proposes to build a dynamic and adaptive reader authority control system, which not only realizes the broadest equality of readers, but also maximize the individual needs of readers. Through empirical research, the paper believes that this method is an effective way to improve the service ability and reader satisfaction of Smart Library.