A interplant model of winter wheat, hot pepper and corn at the line spacing of 4~5:2:0.5 is created successfully by Shaanxi province, which used the principle of biological reciprocity. It not only constructed a favorable environment of its growth, but also increased the yield of winter wheat4900-5200kg/hm2, increased dry hot pepper 450kg/hm2, and also saved the input of disease prevention 900-1200 Yuan(RMB)/ hm2. On the other hand, a five-key-techniques of its interplant is showed by this paper.
