目的  探讨随着自然地理因素（经度、纬度、年平均温度、年均日照）的变化，壮侗语族族群身体组成成分的变化规律。   方法  采用生物电阻抗法，测量了中国壮侗语族13个族群5098例身体组成成分数据，搜集13个族群的经度、纬度、年平均温度、年均光照资料，以人均可支配收入为控制变量，将身体组成成分分别与经度、纬度、年平均温度、年均光照进行偏相关分析。   结果  随着经度增大，壮侗语族族群的脂肪率下降，肌肉量、推定骨量、水分率变化不大。随着纬度增加，壮侗语族族群男性脂肪率减少，肌肉量增多（主要是四肢肌肉增多），女性脂肪率增多，肌肉量减少（主要是上肢、躯干肌肉减少）。总体说来随着年平均温度的增加，壮侗语族族群男性脂肪率增大，下肢肌肉减少，女性脂肪率减少，肌肉量增多。随着年均日照的增多，男性体脂率增多，肌肉量减少；女性体脂率减少，肌肉量增多。   结论  自然地理因素（经度、纬度、年平均温度、年均日照）对壮侗语族族群身体组成成分有明显的影响。

Objective To discuss the law of the change of body composition of Zhuang-Dong ethnic groups with the change of natural geographical factors(longitude, latitude, annual average temperature and annual average sunshine).    Methods  The bioelectrical impedance analysis (BIA) was used to measure the body composition data of 5098 cases of 13 ethnic groups of ZhuangDong group in China. At the same time, collect the relevant data of longitude, latitude, annual average temperature and annual average sunshine of 13 ethnic groups, and use per capita disposable income as a control variable to perform partial correlation analysis about body composition with longitude, latitude, annual average temperature, and annual average illumination.    Results  Zhuang-Dong group fat rate decreased and little change in muscle mass, presumption of bone mass, and water content with the increase of longitude. With the increase of latitude, the fat rate of males in the Zhuang-Dong ethnic group decreasesd, muscle mass increased (mainly muscles in the extremities), female fat rate increased, and muscle mass decreased (mainly in upper limbs and trunk muscles).In general, with the increase of the average annual temperature, the fat rate of males in Zhuang and Dong ethnic groups increased, lower limb muscles decreased, female fat rate decreased, and muscle mass increased. With the increase of the average annual sunshine, the body fat rate of men increased and the muscle mass decreased; the body fat rate of women decreased and the muscle mass increased.    Conclusion  Natural geographical factors (longitude, latitude, annual average temperature, and average annual sunshine) have significant effects on the body composition of the Zhuang-Dong ethnic group.