针对临河-哈密铁路沿线沙害现状，在临哈铁路K420和天鹅湖-策克口岸铁路K25风沙防治工程区分别设置三维气流场观测断面，使用三维超声风速仪，同步观测移动点和固定点的水平和垂直风速，对工程区的阻风效率、沙层湿度、粒度、植被特征进行了初步分析。结果表明：高立式沙障和聚乙烯（PE）网格沙障在1 m高度处，平均水平阻风效率分别为0.79和0.90；大网格（2 m宽、50 cm高）的平均水平阻风效率（0.67）优于小网格（1 m宽、20 cm高，对应值0.75）。多道沙障设置时，建议将沙障间距由目前的35 m减小到20 m，使每道沙障都处在前道沙障的风影区内，继而有更多的沙粒沉降固定在沙障之间；防沙网格内沙层体积湿度明显高于沙障积沙带，通常在20 cm深度达到最大值，深层湿度大于4%；地表沙粒平均粒径固沙网格内（0.259 mm）>沙障积沙带顶部（0.219 mm）>轨道间（0.146 mm）；各防沙工程区内植物种总数为17种，梭梭、柠条、白刺和白沙蒿为主要建群种。

In view of the present situation of sand damage along the Linhe-Hami Railway， three dimensional flow field observation sections were set up in sand control areas along the Linhe-Hami Railway K420 and the Tianehu-Ceke Railway K25. The horizontal and vertical wind speed of mobile point and fixed point were synchronously observed using the three dimensional ultrasonic wind speed sensor， the wind drag efficiency， sand layer humidity， grain size， vegetation characteristic of engineering area were preliminarily analyzed. The results show that the average horizontal wind speed drag efficiency of the sand barrier and the grid is 0.79 and 0.90 at the height of 1 m. The average horizontal wind drag efficiency of the large grid （2 m wide， 50 cm high） at the height of 1m is 0.67， which is better than the 0.75 of the small grid （1 m wide， 20 cm high）. We suggest that the distance between sand barriers should be reduced from the current 35 m to 20 m， so that each sand barrier is in the wind shadow area of the front sand barrier， and more sand is fixed between the sand barriers. The volume humidity of the sand layer in the grid is obviously higher than that of the sand-barrier aeolian sand belt， which usually reaches its maximum at a depth of 20 cm and the deep humidity is more than 4%. The analysis of average particle size of surface sand shows that the sand fixing grid （0.259 mm） >the top of barrier sand belt （0.219 mm） > track （0.146 mm）. The total number of plant species in each sand-control engineering area is 17， among which Haloxylon ammodendron， Caragana korshinskii， Nitraria tangutorum and Artemisia sphaerocephala are the main dominant species.