Soilcrust is a self-protection for the soil to resist wind erosion,which can stabilize the ground and greatly enhance the
resistance of ground soil against wind erosion,so it calls more and moreattention to the uncultivatedand deserted area.There are two kinds of soil crusts: physical
soil crust and biologicalsoil crust.Theproductionof the latter needs a long time,whilethe former can be formed easily after a dry and wet process.This research studies the relationship between the formation of physical soil crust and the percentage of water in the soil,the content of salt,and the composition of soil particle in the light of analysis after the observation on the samples of soil crust of the original state from different soil on the spot,and observesthem with electronic microscope,also analysesits actions onthe soil
anti-erosion in detail,so that they can be paid enough attentionto prevent the soil-desertificationin the dry and cold areas,and reduce subjective factors destroying the soil crust and decline the damage extent to the ground soil caused by wind erosion in winter and springbased on outer means.