Abstract: In spite of the fact that the western arid regions are different in zonality and ecological environments from east to west, but the activities of soil enzymes in surface layer, crust thickness and toughness of all stabilized sand dunes are highest as compared with semi-fixed and shifting sand dunes; while those in crusts of semi-fixed sand dunes and shifting sand dunes rank moderate and least respectively, in addtion to the shifting sand dunes remain their loose surface.