Abstract:Research purposes： Lanzhou - Xinjiang high - speed railway as the Chinas first high - speed railway across the wind area of Gobi desert，which inevitably meet a series of problems of sand - wind in the course of operation. In order to protect the safety of train operation，various sand control measures were built on both sides of railway which well played the sand prevention effect. Because the railway has the characteristics of long distance and large span，wind sand disaster appeared in some special sand control engineering area. Through observing the field experiment，the principles and effects of the different sand - blocking walls in sand - trapping are discussed，which will provide some technical support for the late design and construction. Research conclusions:( 1 ) There will be a disturbed zone in the back of the sand - blocking wall. The energy dissipation of the inclined plank sand - blocking wall is more efficient than that of the sand - blocking wall，vertical - type PE net sand barrier take the second place and the inserting - type concrete sand barrier was the poorest. (2) Negative correlations is discovered between the sand - blocking rate and the vertical height. Within 4 meters height，the sand ?blocking rate of the vertical - type PE net sand barrier ， the inclined plank sand - blocking wall ， the sand - blocking wall are about 85. 82; 60. 34; and 52. 92; (3) After through the sand - blocking wall, the composition of sand particle changes. The percentage of coarse particles in windward side sand flow increases, but the size of most sand particle are still between 0. 1 to 0. 25mm and 0. 25 to 0. 5mm. (4) The experimental results have guiding significance for sand prevention project for high - speed railway in the wind area of Gobi desert.