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北京地区在我国两熟制区所占的面积较小,但粮食生产的地位在农村工作中却很重要.建国以来,为了持续稳定增加粮食产量,充分利用京郊农业气候资源,在种植制度方面几经变革.如50年代就开始了小麦、玉米大垅套;60年代实施了“小对垅”、“三密一稀”的耕作栽培技术;70年代推广了“三种三收”种植“,”The Basis on the analysis of important of crop super-high yield and construction regulation and characters of crop production in Beijing area, where is double cropping system. It has been put forward that the heat energy was used with plastic film covered maize sown early spring season, light energy was used with C4 characteristic of double season maize, and the function of crop source-sink regulation was used with decreasing plant size and increasing plant density and double ear for super-high yield 1400~1500kg/mu during whole year. The exploration research shown that it was possibility for double season maize to bring about super-high yield 1300~1500kg/mu. increase