Objective] To study the effects of planting density on the yield and leaf area index of Demeiya 3, and to find the proper planting density.[ Method] With spring corn variety Demeiya 3 in the 855 Farm of Mishan City in 2015 as the materials, five planting densities were de-signed.Leaf area was measured at jointing stage, bell stage, silking stage, filling stage, dough ripeness stage.The yield and its component fac-tors were detected and analyzed.[Result] Yield reached the maximum (9 009.21 kg/hm2) at the 75 000 plants/hm2 planting density.At bell stage, LAI had the greatest impact on ear number, showing positive correlation.LAI at filling stage and silking stage showed the greatest impact on seeds per ear and 100-grain weight, showing negative correlation.[Conclusion] The optimal planting density of Demeiya 3 in the 855 Farm of Mishan City is 75 000 plants /hm2 .%[目的]研究种植密度对玉米叶面积指数及产量的影响，寻找最适种植密度。[方法]2015年在黑龙江省密山市八五五农场以春玉米品种德美亚3号为材料，设定5个种植密度，在拔节、大喇叭口、吐丝、灌浆、蜡熟5个时期测量其叶面积，并在收获后对产量及其构成因素进行测定与分析。[结果]种植密度为7．5万株／hm2时产量最高（9009．21 kg／hm2），大喇叭口期LAI对穗数影响最大且呈正相关；灌浆期LAI、吐丝期LAI分别对穗粒数、百粒重影响最大且呈负相关。[结论]黑龙江省密山市八五五农场德美亚3号最适种植密度为7．5万株／hm2。
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