Sustainable developmentof oasis system depends mainly on the stability of oasis margin in arid zone. Aiming atthe issues of natural vegetation deterioration and ecological function decline,the presentsituation of natural vegetative and the cause of its deterioration were detected clearly by jointly adopting the methods of field investigation and related research resultcollection. From analyzed results for the reasons of vegetation deterioration,itcan be deduced thatprotection measures should protectpresentvegetation accord- ing to their ecological characteristics,and choose species thatsuitlocal environmentto enlarge artificial for-estry areas,and adoptreasonable economic policy.