[Objective] To achieve the field scale fertilization decision-making and precise fertilization and attain fertilizer digital extension of the soil testing.[Methods] Practical application with the examples of Paofang village, Dingwen town, Jianwei county as an example by the method of ArcEngine module of GIS to integrate GIS, RS, GPS with agriculture experts technology, with remote sensing image as the index, village scale farmland fertilization expert system of touching screen was developed. By using the experimental data of "3414" in Sichuan Province from 2005 to 2009, on the basis of the facts, fertilization recommendation model of the main grain and oil crops was established for the expert system. [Results] The system not only realized the fertilization decision-making and nutrient management of field scale, but had inquiry function such as the basic farmland information, deficiency diagnosis, pest control, policies and regulations and safety common sense et al.[Conclusion] The fertilization information system achieved the precise fertilization on the field scale, which has the characteristics of friendly interface and simple operation, finally attained fertilizer digital extension for the field scale of villages.