The content,strengths and problems of rape-maize-potato dry-land interplanting model was described in the paper.Yield and benefit of the model in controlled test and production application was reported.It was analyzed that its popularization and application prospect in Chongqing was about 66700 hm².Suggestions were put forward,i.e.,enhancing its special research,demonstration and extension according to local conditions and improving multiple crop index,etc.