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在描述库布齐沙漠和毛乌素沙地沙丘基底地形之后，分析了流动沙丘分布规律与基底地形的关系。在明确沙地形成时代概念的基础上，论证了该沙漠与沙地分布范围上的稳定性，库布齐沙漠为扩展型的，毛乌素沙地属稳定型的。库布齐沙漠的风沙危害包含了直接与间接危害２种类型；毛乌素沙地风沙危害主要是沙丘再流动，有３种危害途径。最后，根据毛乌素沙地沙丘分布规律，分析了引起沙丘再流动的人为因素和自然因素，及其各自所占的比重。
After describing the topography of sand dunes in the Khuzizi Desert and Mu Us Sandy Land, the relationship between the distribution law of the moving sand dunes and the basement topography has been analyzed. On the basis of clarifying the concept of era of sand formation, the stability of distribution range of the desert and sandy land is demonstrated. The Kubuqi Desert is an expanding type, and the Mu Us sandy land is stable. Wind and sand hazards in the Khuzqi Desert include two types of direct and indirect hazards. Wind and sand hazards in the Mu Us Sandland are mainly the re-flow of sand dunes, and there are three kinds of hazards. Finally, according to the distribution rules of sand dunes in Mu Us sandy land, the human factors and natural factors that cause the re-flow of sand dunes and the proportion of their respective share are analyzed.