对３种种植密度条件下小麦粒重分布特性的研究结果表明：小穗粒重、小穗结实粒数、各粒位粒重和结实数均以中下部小穗为最大，随植株密度的增大，穗粒重和穗粒数呈逐渐减小的趋势，小穗粒重、小穗结实粒数、各粒位的粒重和结实数也呈下降的趋势；不同粒位间的粒重，在结实数大于０．９５的情况下，表现为第２＞１＞３＞４粒位，在其它情况下则表现为第１＞２＞３＞４粒位 The results of grain weight distribution under three planting densities showed that the spikelet weight, the number of spikelets, the grain weight and seed number of each grain were the largest in the middle and lower spikelets, with the increase of plant density The grain weight, spike grain weight and spike grain number tended to decrease. The grain weight of spikelet, the number of spikelets, the grain weight and seed number of each grain were also decreased. The grain weight, 2> 1> 3> 4 loci in the case of the seed number greater than 0.95, and in other cases, 1> 2> 3> 4 loci