Abstract: Field experiments have shown that changing traditional narrow mode of interplanting wheat and maize to medium or wide mode can slightly increase the light quality on wheat band and obviously improve the lighting and temperature environment on maize band before maize reaches the height of wheat.The average sunlight transmission rate has increased by 11.0%～11.5%;leaf temperature was 0.4 centigrade high. Maize would shade wheat as its height over wheat while the vegetative growth condition of wheat and maize,especially maize have been improved under medium and wild interplanting situation.The ear initiation has been promoted but grain weight has been affected to a certain extent.Wheat unit yield decreased by 13.89%～22.58%,maize and total yield of two crops were 30.00%～37.71% and 11.47%～12.26% higher with the extension of interplanting width.Yield stability index of system lowered 0.0125～0.0338.