Taking Xuancheng City of Anhui Province as a study case, this paper, supported by the technique of GIS, decided the evaluation unit by overlapping the soil map and land use type map, selected fourteen influential factors from three aspects, i.e., soil nutrient content, soil nutrient availability and site condition, established the evaluation system and model of farmland productivity, adopted the methods of Analytical Hierarch program(AHP), Fuzzy Mathematics Theory(FMT) and Integrated Index to synthetically evaluate the farmland productivity. The results were well in line with the local situation, thus the method adopted here can provide a technical support for the similar work in China.