Abstract: In order to provide specific maintenance for the mechanical sand prevention system along the Alar-Hetian Desert Highway,the research group made a detailed survey and researched about its present and wind-sand environment. The situation and spatial difference of blown sand hazard of the mechanical sand prevention system along the Alar-Hetian Desert Highway using the GIS spatial analysis function. The study results show that: ① the heavier and heavy disaster sections of the straw checkerboard mainly distribute K400-K417,K505-K578,K600-K610 a total length about 100 km,only account for percent 24.8 of overall length; the serious damage of the fence along the highway mainly concentrated in the middle and partial southern of the road,a total length about 199 km,accounting for percent 49.3 of overall length. ② In K227-K311 sections,the damage extent on the east side of the sand protection system is heavier than the west side. The sections in which the extent of damage on the west side is heavier than the east side are mainly distributed in the 80 km range of the Hongbaishan.③ The damage extent in 5 geomorphic types is 0.67,0.75,0.79,0.80 and 0.70,respectively. In area Ⅰ the damage is lesser,Ⅱ and Ⅴ medium,Ⅲ and Ⅳ heavier. The lighter damage sections of the sand protection system are mainly distributed in the north and south tip and the heavy sections mainly focus on K382-K582 sections in the middle of the road.

Key words: sand prevention system, blown sand hazard, straw checkerboard, sand fences, geomorphic type, Alar-Hetian desert highway