Abstract: In order to evaluate the farmland environmental quality for the edible agricultural product accurately and improve the edible agricultural product security. Agricultural environment of Jianshui county in Yunnan province was kept monitoring for consecutive years, six web-spatial databases were developed by WebGIS and database technology, including agricultural basic database, agrometeorology database, soil property database, atmospheric pollutant database, soil pollutant database, and irrigation water pollutant database. According to China national standard, farmland environmental quality evaluation standards for edible agricultural products, an evaluation model was developed to evaluate the environmental quality of atmosphere, soil, and irrigation water for edible agricultural product farmland. With the six databases and the evaluation model, an information service system based on WebGIS was developed by the tools SupMapGIS and Visual Studio 2005. The system can be used for the telematic of agricultural environment, spatial analysis of pollutant information, the evaluation of single pollutant in atmosphere, soil and irrigation water, and comprehensive evaluation of farmland environmental quality. This study can provide references for development of Decision Support System of non-pollution agricultural product planting and agricultural regionalization and decision- making in non-pollution agricultural production.