Abstract: In this paper, the influences of different oasis distributions on the regional climate have been studied by numerical simulation using the non-hydrostatic balance mesoscale model MMSV3, the ground energy balance and the influence on the characteristic of the boundary layer also have been analyzed. It provides some theory foundation for governing the desertification. Desertification would make the sensitive heat flux increase; the latent heat flux decrease; the ground temperature rise(0.7℃ in five days), to which the soil temperature is similar; and the friction velocity be smaller. In the long run, it will results in more deteriorating regional climate knocking the alarm bell to the people. While greening could lead to the latent heat flux increasing (more obviously in city); the temperature falling; the humid being higher and the friction speed being bigger. That can prevent the dust storm effectively and has an advantage of managing the environment of the semi-arid region.

Key words: oasis, desertification, the boundary layer