Absrt act:The main growth characters of Phyllostachys edulis seedlings whose seeds were irradiated by 5 different doses of 60 Coγrays were investigated and explored by using principal component analysis method, for the sake of finding new excellent gene re-sources and widening the hereditary basis of Phyllostachys edulis.The results indicated that near 90%information of seven growth characters ( average single-plant ground diameter, average single-plant seedling height, maximum ground diameter, maximum seedling height, number of tillers, canopy diameter, and root breadth) could be condensed into three principle components.The first principle component mainly consisted of plant height and ground diameter factors.Five superior seedlings were finally screened out by calculating and comparing the values of key principal components of various varieties, and the results were similar to the prac-tical phenotype of bamboo seedlings in the nursery.%为从辐射处理的毛竹实生苗中发掘优异基因资源，拓宽毛竹遗传基础，以不辐照的种子为对照，对经5个不同辐射剂量处理过毛竹种子繁育出的实生苗主要生长性状指标（单株平均地径和单株平均苗高、最大地径、最大苗高、分蘖数、冠幅和根幅）进行主成分分析。结果表明，主成分分析可将7个性状综合为3个主成分，其累计贡献率近90％，第1主成分是以株高和地径因子为主导。通过计算各品种的主成分值进行比较，最终选出了5株综合生长性状优良的实生毛竹苗单株，其结果与圃地竹苗生长表型相近。
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