This paper evaluated the sensitivity of soil erosion，stony desertification and environmental sensitivity. The evaluation on soil erosion sensitivity mainly considered the factors of the force of precipitation erosion，topography，soil texture and land covers. The evaluation on stony desertification sensitivity mainly considered the factors of topography，geomorphology and vegetation cover. The evaluation on environmental sensitivity mainly considered species richness and species quantity protected by the nation or Yunnan province. The results showed that the areas slightly sensitive and moderate sensitive to soil erosion make up 35.61％ and 41.30％ of the province (3.84×105km2)，respectively. The regions not sensitive and sensitive to stony desertification comprise about 65.09% and 34.91% of the province，respectively. The areas with no，high and extreme environmental sensitivity make up 41.50％，39.69％ and 14.25% of the province.