A wind tunnel simulation of the characteristics of sand drift over a nylonnet barrier with a porosity of about 30%,a grass barrier,and Gobi and mobile sand surfaces has been conducted.The aim of this paper is to describe the relationship between different underlying surfaces and air current turbulence and how characteristics of the underlying surface affect the movement of wind-blown sand and the wind velocity profile in sand-laden layers.A attempt ismade to establish a theoretical base for optimizing the design of sand-control engineering in the field.This study has found that,for different underlying surfaces,there is a relationship between sand transport rate the same height above the surface at different velocities.Thus,air current turbulence can be considered as an index to determ ine the distribution of sand in the sand-laden layer and an important criterion determ ining impacts of movement.