Abstract: The main purpose for establishing the database was to provide technical support for biological control on agricultural and forest pests.By using SQL Server 2005 database,ASP.NET web programming,B/S framework based on TCP/IP protocol,and three-layer structure,a database on pests and their natural enemies for 8 crop plants was developed.The database offered multiple inquiry methods,convenience in communication and interaction,as well as,excellent expandable functions.On the one hand,site operators could enter,modify or delete information,graphics or video in the database through the background management system.On the other hand,users could use the Internet to get their needed information through various retrieval methods or search engines.Interactive communication between users and the site could also be carried out through remote diagnosis system,remote video conference service and technical BBS.