At present, there are many problems in the library automation management systems used by medium and smallsized libraries in China. For example, a lot of information is stored not safely; information cannot be stored for a long time; the ability to modify the library service at once is poor; it cannot provide the users with characteristic service. In order to satisfy the developmental needs of the library, the library automation management system of SaaS (Software-as-a-Service) fully uses the cloud computing ability and integration ability of information resources, absorbs and integrates information resources and computing resources by service renting, providing multiple users with personalized, accurate, rich service. It provides the most reliable and safe data storage center, easily achieving the sharing of data and application among different equipment, to maintain rapid system response.