Abstract: Hexi corridor is located in the arid and semi-arid regions of China. Due to the influence of the surrounding desert and gobi, the area is affected by various forms of sandstorms. Based on the theory of disaster system, this paper constructs the regional wind-blown sand disaster risk assessment system and assessment model from the aspects of the danger of the hazard risk factors, the vulnerability of the hazard pregnant environment and the vulnerability of the hazard-bearing body, and evaluates the risk of wind-blown sand disaster in the Hexi corridor. The results show that:(1) The extremely high risk areas are the desert areas in the Hexi Corridor, accounting for about 10.8% of the total area, such as Dunhuang City, Yumen City, Jinta County, Gaotai County, Linze Conty and the north of Wuwei City. The high risk areas are mainly distributed in Dunhuang City, Aksai Kazak Autonomous County and north of the Hexi Corridor, about 56.5% of the total area. The low risk areas are located in the southeastern part of the Hexi Corridor, where the vegetation cover is high and the precipitation is abundant under the natural barrier of the Qilian Mountains. (2) As the main body and object of the wind-blown sand disaster, the social and cultural factors of the Hexi Corridor contribute less to the result of assessment, as the material basis and dynamic conditions of wind-blown sand disaster, blown sand and wind are still the main causes of wind-blown sand disaster in Hexi corridor. (3) There is a higher vulnerability of wind-blown sand disaster for economically developed cities. We should pay more attention to the sand source near by the cities.

Key words: Hexi Corridor, wind-blown sand disaster, assessment