Abstract: In order to study wind-sand flow structure of 0-50 cm in the mobile sand dune of Ulanbuh desert, to reveal motion law of wind-sand flow in the mobile sand dune.On the basis of data measured through wind-sand flow structure in the mobile sand dune of ulanbuh desert , Analyze wind-sand flow structure of 0-50cm vertical height using method of fitting curve and the fitting equation etc. the result express :（1）the sand transpoiting rate in 0-50cm height inside and each high layer all present power function relation with wind velocity.（2）the sand transpoiting rate in each high layer and height present decreasing function of exponential relation.（3） the sand transpoiting rate in upper,middle and low layers present the power function relation with the rate of sand transpoiting in 0-50cm height inside.