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本文根据平塘县1994～1995年县城中心小学1729名学生的体质调查资料，对身高、体重、胸围和坐高等4个形态指标进行主成分分析，结果表明无论男女生，第一生成分（大小因子）和第二主成分（形态因子）是评价生长发育的两个主要因素，其累计贡献率分别为91．529％和92．129％。主成分标准得分与身体指数的相关分析表明：第一主成分主要与W／H和S／H等身体大小指数相关，而第二生成分与C／H、W／H2和W／H3等身体形态、营养指数关系密切。
According to the survey data of 1729 students in county primary school in Pingtang County from 1994 to 1995, the principal component analysis of body shape, body weight, chest circumference and sitting height were carried out. The results showed that no matter the male or female students, Factor) and the second principal component (morphological factor) are the two main factors to evaluate the growth and development, with the cumulative contribution rates of 91.529% and 92.129% respectively. The correlation analysis between the standard score of main component and body index showed that the first principal component was mainly related to the body size index such as W / H and S / H, while the second component was related to the body such as C / H, W / H2 and W / H3 Morphology, nutrition index is closely related.