Abstract: The processes of desertification in dry regions have occurred mainly in the lower reaches of rivers. The channels of the processes of desertification have principally 4 sorts: producing sands on the spot, wind erosion on oases, drift sand intruding and flooded gravel burying oases. The substance of the processes of desertification is a sort of process of the oases transference that had happened owing to the moving and redistribution of resources of water of oases by virtue of mankind’s un-reasonable action of land exploitation. Along with the processes of transference, original oases had shrurk and new oases had emerged. The desertification had occurred in one place, and new oases had been formed probably in other areas. The oases are principally the outcome of resources of water. So long as there are not great changes in atmospheric circulation and total amount of water in the valley, the general area of the oases will not alter greatly in the valley. Desertified land can reverse under definite circumstances, but the reverse in dry regions is nearly impossible.