对10个常用玉米自交系进行完全双列杂交，以杂种优势距离为指标进行聚类分析．结果表明，10个自交系可划分为5类，即818、330为一类群；Mo17、龙抗11、龙抗92为一类群；系14、龙抗31B、龙抗56A为一类群；8112和黄早四各成一类。各类群间有着不同的遗传背景，类群间平均优势值较高，类群内优势值较低．

Heterozygosis distance of yield character in 45 progenies were evaluated and cluster analysed in a complete diallel crossing with 10 elite inbred lines in 1994 in Harbin．The result showed that five groups which have different genetic background were divided according to the hybrid vigor distance.The value of average hybrid vigor was higher in different group and lower in the same one.