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According to the result of soil sampling and test, soil properties map can be achieved by interpolation. After that, a prescription map can be generated to conduct variable-rate fertilization. This process is the core of precision agriculture. It can not only save fertilizer, but also improve economic and environment benefit. The system which was based on geography information system (GIS) could: 1) interpolate soil properties map by Kriging method; 2) integrate yield, meteorological data and soil data into a database; 3) loose coupling GIS with knowledge model based on Web services technology; 4) generating and releasing a prescription map on Web, and sharing the model-base on Web. The study constructed the basic frame and process flow of prescription map based on knowledge model, Web services and WebGIS, improved the rationality and reliability of the prescription map, implemented to generate and release a prescription on Web, and make it easy for user to get a prescription map.