The purpose of the paper is to explore the demarcating method of basic farmland based on land evaluation, landscape ecology and spatial clustering, which can be the references to the protection of basic farmland pla nning. The research methods are land evaluation, landscape fragmentation index and spatial clustering. The results indicate that: 1) the spatial difference of farmland quality in Hefeng County was described by evaluation indexes of four elements, eleven factors and data standardization of numerical type, linguistic type, spatial d...