This article firstly states the development stages of library automation,the current situation and existing problems of system development;Secondly,the knowledge of ASP..NET,including NET.framework,ASP.NET and SQL 2000 is introduced;then,under the background of KeXin College library,it focuses on the demand analysis of library management system,the partition of function modules and the analysis of database patterns and also devises the database structure,modules' interfaces and code;Lastly,features of the system are summarized,and imperfections which need to be improved later are put forward.