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选择不同年代育成的１１个玉米自交系为代表，对株型和产量组成两类共９个性状进行了遗传改良趋势的研究。结果表明：各性状的遗传方差均达极显著水平（α＝００１）。影响玉米自交系耐肥、抗倒伏性的穗位／株高性状以及决定玉米耐密植性的叶向值等性状的改良效果最显著，改良趋势最明显。而穗部性状的改良趋势只有穗粗比较明显
The eleven maize inbred lines bred in different years were selected as the representative to study the genetic improvement trend of nine traits including plant type and yield composition. The results showed that the genetic variance of each trait reached a significant level (α = 001). The improvement effect of traits such as ear position / plant height and resistance to close tolerance of maize inbred lines were significant, and the improvement trend was the most obvious. The improvement trend of ear traits is only obvious ear spike