The Hengduan mountains is a natural region with strongy dissected relief, and hence a series of virtical bioclimatic zones. Relatively speaking, the land resource is characterized by a series of land types with conspicuous areal differentiation, such as wide cold highland and steep land, land rich in resources suitable for forestry and animal husbandry, less suitable for cultivation and an instable ecology, etc., The agricultural evaluation of less resource and the rational development of land in the Hengduan Mountains should be mainly based on the natural ecology of land, the vertical zonality and, generally, the limitation of slope.According to the suitability and limitation of land for agriculture in the Hengduan Mountains, this paper suggests a land classification system including suitable order of land, suborder of land and class of land, and some relative factors of evaluation and their numerical appraisal indexes.