This research analyse on the soil nitrogen variation features of different ecological patterns in estern desertification region,Guizhou province. The author gathered soil samples of woodlands, grasslands, agricultural land and de-farming land, then carried out physics and chemical analysis. The results showed soil organic matter, nitrogen levels overall lower ,its content increase with the increasing of vegetation cover, degree with the strengthening of soil erosion and reduction, and the nitrogen levels of return with the return of soil nitrogen level limit increases then increased by tiine pasted. Based on this conclusion, the paper deduced that it is possible to restore the nitrogen fertility under natural condition.