Abstract: The arrival of big data and cloud computing era has brought new service mode, service concept and service forms to library and provided readers with a better reading experience. At the same time, the data storage management is also facing new challenges. With the increasing amount of data, data security has become more and more important. Based on the management practice of electronic resource storage in Library of China University of Political Science and Law, this paper probed into the problems existing in the library about electronic data migration and data storage security management, and gave the relevant solutions.