Abstract: Sansui county, Guizhou province as an example. 11 indicators selected from the aspects of the natural endowments, the infrastructure and the others were scored based on the results of farmland classification, the Delphi Method and the GIS tools. Then the method of gray clustering assessment was used to evaluate the basic farmland, which was clustered in 4 grades named bad, medium, good and optimal. The results showed that the overall situation of basic farmland in Sansui county was good, and the natural endowments part of it was optimal, the infrastructure part was medium and the others part was medium. This research would provide recommendations for the future construction of well-facilitied capital farmland.