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【目的】本试验用各阶段柯尔克孜公、母羊体尺指标对体重变化的影响，分析初生、断奶、8月龄三个阶段体尺指标与生长发育过程中体重的相互关系。【方法】试验随机选取柯尔克孜羊初生羔羊372只、断奶羊321只、8月龄羊223只，共计916只，测定其体重(Y)与体尺指标：体长(X₁)、体高(X₂)、胸围(X₃)、管围(X₄)，并利用SPSS.27对各阶段柯尔克孜公、母羊进行相关性、通径分析及多元线性回归分析，并建立不同阶段柯尔克孜羊体重与体尺的最优回归模型。【结果】结果表明：柯尔克孜公、母羊体尺指标中体长、体高、胸围、管围与各阶段的(初生、断奶、8月龄)体重呈极显著正相关(P<0.01)，不同阶段对体重直接作用最大的体尺指标为胸围，其次为管围和体高。初生、断奶、8月龄阶段柯尔克孜羊三个年龄段的体尺指标中胸围对体重的直接与间接作用均大于其他三个体尺指标对体重的直接与间接作用。【结论】本试验不同阶段的回归方程可以用于柯尔克孜羊早期选育实践，并且研究结果说明在柯尔克孜羊生长发育过程中，不仅要重视体重的选择，还要加强对体尺指标的选择。

【Objective】Analysing the effect of body size indexes on body weight of Kirghiz sheep males and females at three stages:newborn,weaned and 8 months old. 【Methods】 372 newborn lambs,321 weaned lambs and 223 8-month-old lambs were randomly selected,totalling 916 lambs,and their body weights(Y)were determined along with body length(X1),body height(X2),chest circumference(X3),tube circumference(X4)and other body size indexes,and the correlation,pass-through and multiple regression analyses were carried out on the data of each stage by using SPSS.27,so that the correlation between body weights of Kirghiz sheep and their body sizes at different stages could be established. The optimal regression model of body weight and body size of Kirghiz sheep at different stages was established.【Results】Body length,body height,chest circumference,tube circumference and body weight at each stage(newborn,weaning,8 months old) were positively correlated with the body size indexes of Kirghiz sheep males and females(P<0.01). The body size index with the largest direct effect on body weight at different stages was chest circumference,followed by tube circumference and body height. The direct and indirect effects of chest circumference on body weight were greater than those of the other three body-size indicators.【Conclusion】The regression equations at different stages can be used in the early selection and breeding practice of Kyrgyz sheep,moreover,in the process of growth and development of Kyrgyz sheep,it is necessary to pay attention not only to the selection of body weight,but also to strengthen the selection of body size indicators.