Abstract: Ecotone farming field and pasture of Inner Mongolia occupy an important position in Regional economy and Ecosystem. Developing Feed Crops on the ecotone of agriculture and pasture, it can not only build an ecosystem of planting as elementary, but also develop production and save degenerate of ecology resource. It encourages the people of ecotone of agriculture and pasture step a road of agriculture together with pasture. Developing Feed Crops can improve the people’s living standard on ecotone of agriculture and pasture and encourage the development of rural economy. It will bring into full play its important function in ecosystem reconstruction.