This web based GIS system aimed to manage the pest and disease and biodiversity, include the yuanyang county geographic information, supply the query, thematic map functions. User could query the variety name, variety type, resistance to planthopper, resistance to rice blast, disease source and so on. This system is developed with Java and Flex technolegy, which is a web application. User need not install any program, just as browse a webpage, access the system through web browser, such as Internet Explorer, Firefox, chrome and safari. System supplys six theme map, any two theme map could be overlayed to analysis the relationship between two factors.