Abstract: Formation of sand accumulation belt in oasis marginal zone is one of the new scientific issues.A sand accumulation belt was formed in oasis marginal zone in the Hexi Corridor,Gansu Province after implementing the project of desertification control in recent 50 years.In order to study the relationships between the causes resulting in the formation of sand accumulation belt and the climatic and environmental factors,the sand accumulation belt in the oasis marginal zone was investigated from the eastern part to the central and western parts of the corridor.The results were as follows:(1) Annual precipitation was the key factor affecting the height and width of sand accumulation belt; (2) Climate and environment information was demonstrated by the vegetation,and precipitation was the key factor affecting the vegetation coverage.The effect of precipitation on the natural vegetation coverage was higher than on the total vegetation coverage including artificial vegetation.With the increase of precipitation,vegetation coverage of leeward slope was higher than that of windward slope; (3) Difference of vegetation coverage among the sample sites was mainly caused by the size of plants,that is,the effect of precipitation on plant size was higher than that on plant density.

Key words: oasis marginal zone, sand accumulation belt, vegetation coverage, precipitation, climate and environment information, Hexi Corridor, Gansu