The constitutive resistance of three species of Eucalyptus was evaluated by principal component analysis,and then a comprehensive e-valualion model was built up. Three principal components and the formula of principal component were pointed out. The analysis indicated that the comprehensive value of constitutive resistance of three leaf ages decreased in the order of old leaves > mature leaves > tender leaves,illustrating that the constitutive resistance of old leaves was better than that of tender leaves and mature leaves; the constitutive resistance of mature leaves in three species of Eucalyptus was shown as Eucalyptus robusta > Eucalyptus urophylla > Eucalyptus exserta, indicating that the constitutive resistance of Eucalyptus robusta were belter than that of Eucalyptus urophylla and Eucalyptus exserta.%笔者应用主成分分析方法对3神不同桉树组成抗性进行了综合评价分析,建立了桉树组成抗性的综合评价模型,提出了反映桉树叶片主要性状的3个主成分因子及主成分公式.分析表明:尾叶桉3种叶龄叶片组成抗性的综合指标值大小依次为:老叶＞成熟叶＞嫩叶,说明老叶的组成抗性较成熟叶和嫩叶好；3种桉树成熟叶的综合指标值大小依次为:大叶桉＞尾叶桉＞窿缘桉,说明大叶桉叶片的组成抗性较尾叶桉和窿缘桉好.
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