Soil mechanical composition,physical features,chemical properties,and total composition of chemical elements of soils are measured for studying the land desertification.The results indicate that fine soil grains decrease progressively by wind and water erosion.Surface layer of soil vanished and it is covered with the sand layer.Soil texture tends sandification,and the contents of organic matter and nutrients reduce progressively.Ability in preserving moisture and fert ility fall down.Soil formation is in the stage of modern erosion and sand deposition,leaching and weathering are weak.The evolution coexists with the degeneration in the development of land resources.