Abstract:The experiments on introduction and plantation were carried out in Shapotou area.The survival rate,preserval rate and the characteristics of thegrowth of plant were observed,and some best sand-stablizing plant species with higher resistant ability and adaptability were selected.On this basis,the mechanism of drought-resistance of these plant species was detailly studied by electric microscope and some analytic methods on the aspect of plantphysiology.Doing so,the scientific evidences on the nature of biology andphysiology will be provided to the introduction of more sand-stablizing plantspecies. On the aspect of morphological structure,by the study,xerophytic succulent Reaumuria soongarica and Calligonum arborescense are characterized by more wax on leaf surface,thicker cuticle and cell wall and by the pittedstoma.But for the xerophytic Caragana korshinskii and Oxytropis aciphylla,their leaf shape is smaller and leaf surface is covered with dense grey floss,covering the stoma,transpiration is then reduced and the leaf-succulent tissue is avoided from burn. On the aspect of physiological nature,these xerophytes are characterized by higher glutinosity of cytoplasm higher elasticity,better permeability,higher capacity for antidetaching of water and heat-resistance,less transpiration,higher content of soluable sugar and higher content of bound water,and higher ratio between bound water and free water,consequently they possess higher capability for the drought-resistance.