Abstract: With 8 kinds of soil that are affected by different farmland sheltbelts in the northeast part of Ulanbuh Desert being selected as research objects and the analysis on soil samples, this paper gains data about soil pH, organic content, total nutrient (N , P and K) and available nutrient (N , P and K). At the same time, the paper analyses the effects of 8 kinds of farmland sheltbelts on farmland soil fertility according to these data. The result indicates that the farmland sheltbelt having 8 lines arrangement (3 lines P. nigra L. var. thevestina plus 2 lines P. alba var. pyramidalis plus 3 lines P. nigra L. var. thevestina and 8 lines P. popularis) and 4 line arrangement (1 line Ulmus pumila L.puls 2 lines Salix matsudana Koidz puls 1 line Ulmus pumila L.) improves noticeably soil fertility. Among the three arrangements, the farmland sheltbelt having 8 lines (3 lines P. nigra L. var. thevestina plus 2 lines P. alba var. pyramidalis plus 3 lines P. nigra L. var. thevestina) has the greatest impact on soil fertility, its available nitrogen and potassium have increased 417%, 138% than the wilderness. The farmland sheltbelt with 8 line arrangement (4 lines Salix matsudana Koidz plus 4 lines P. popularis) and 2 lines P. Canadensis Moench. Verz hardly improves soil fertility.

Key words: farmland sheltbelt, different arrangements, soil fertility