Abstract: By alternate strip planting millet with soybean,the microclimate in the field such as the air temperature,luminosity and CO₂ density is improved which promote the growth and physiological reaction of the foxtail millet.The results are that:leaves area of the millet are increased, stomatal resistance decreased, photosynthesis,transpiration and respiration are all improved,dry matter accumulated is increased and matter transformed to spike is quickened,the harvest index and water and light utilization efficiency are increased,higher yield and higher benefits are achieved.