Abstract: Eco-engineering of integration of crop-livestock is a complex engineering of agro-ecological,economical and technological system.It is composed of three sub-systems including plant (crop industry),animal(livestock industry)and microbe(linking crop and livestock industry),in which the crux of matter is to set up an effective and saving grain animal production eco-engineering system called “4,3,2,1”animal production model.The main planting models of integration of crop-livestock was found such as“one crop and one feed”,“one crop and one economy plant”,“two feeds and one crop”and“one crop one economy plant one feed”.The core of planting models of integration of crop-livestock is setting up acoordinated“crop-economy-feed”planting model with crop production as base,feed production as focal point,economy plant production as power.The suggesting proportion of the three plants is 5∶2∶3.