Farmlands are the largest and most important parts of the oases in the middle reaches of the Heihe River，accounting for 84.2% of the total area of oases in the region.Shelterbelts of farmlands constitute the principal ecological conservation system of the oases.Only through better development of shelt belts can the coverage of forest in the oases be greatly enhanced，and thus the ecological environment of the oases in this region improved.The realistic pathway for further development of farmland shelt erbelts is to construct multispecies shelt erbelts，to improve regeneration of shelt erbelts and to explore water-saving technologies.