Abstract: 【Objective】 This study is aimed at clarifying the correlation among body size indexes such as body weight, body height, body length, chest circumference, chest width, chest depth and tube circumference of Hotan sheep at different growth stages, in the hope of providing direction and theoretical basis for breeding selection and identification of the sheep in later stage. 【Methods】 In this study, SPSS 19.0 was used for descriptive statistics and cluster analysis, and SAS 8.1 was used to carry out principal component analysis on seven body size indexes of body weight, body height, body length, chest circumference, chest width, chest depth and tube circumference of sheep at three growth stages of birth, first year and adult. 【Results】 First, the coefficient of variation of body weight was the largest at all growth stages and the coefficient of variation of body height was the smallest.Second, in the cluster analysis, body weight, tube circumference, chest width and chest depth were grouped together in the newborn stage, body height, chest circumference and body oblique length were grouped together in the first year, body height, body oblique length and chest circumference were grouped together in the first year, chest depth, chest width and body weight were grouped together in the first year, and tube circumference was grouped together in the first year.In adult Hotan sheep, body height, body diagonal length and body weight were grouped into one category, chest depth, chest width and tube circumference were grouped into one category, and chest circumference alone was grouped into one category.There was only one principal component in the primary stage, and the body size indexes in the first year and adult stages were divided into four principal components. 【Conclusion】 When improving the economic traits of Hotan sheep, the weight, chest circumference and tube circumference should be the main indicators in each body ruler, and the body height, chest depth and chest width should be taken into account, and the corresponding indicators should be used to judge the economic traits, so as to improve the seed selection and breeding speed of Hotan sheep.