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采用毛白杨优树及其轮交、回交无性系为试验材料，运用多元统计方法对１３个性状进行了综合分析和遗传距离估算及聚类分析，结果表明：所调查的１３个性状在３４个无性系间差异达极显著水平，且具有中等以上的遗传力；前４个主成分的特征根的累积贡献率达８８．４８％，被分别称为生长因子、冠形因子、干形因子、干形与分枝的综合因子；在遗传距离为５的并类水平上把３４个无性系分为４大类，类间遗传距离显著大于类内遗传距离，第Ⅰ类的２７个毛白杨优树无性系又可分为５个亚类。文中还对毛白杨选择育种的策略和方法进行了讨论。
Using Populus tomentosa and its rotation, backcross clones as the test material, using multivariate statistical analysis of 13 traits comprehensive analysis and genetic distance estimation and cluster analysis showed that: the 13 traits investigated in 34 The clonal differences among clones reached extremely significant level with a moderate to higher heritability. The cumulative contribution rate of the eigenvectors of the first four principal components reached 88.48%, which were respectively referred to as growth factors, crown factors, dry factors , Dry and branch. The 34 clones were classified into 4 major groups at the genetic distance of 5 and the genetic distances between the two groups were significantly greater than those within the class. The 27 species of Populus tomentosa You-tree clone can be divided into five sub-categories. The article also discussed the methods and methods of poplar selection breeding.