应用显微测微尺，对狍（Ｃｏｐｒｅｏｌｕｓｃａｐｒｅｏｌｕｓ）肩部和前肢部的冬夏被毛进行髓质指数测算，差异显著性检验表明，狍被毛的髓质指数既存在显著的季节性差异，也存在身体部位差异，即躯干部冬毛的髓质变得极为发达，肢体部冬毛的髓质却显著变细，前者是执行保温功能的适应性变化，后者是执行保护功能的适应性改变。揭示了狍在适应环境的季节性变化时，被毛因不同功用而发生髓质指数的不同改变 The microscopic micrometer was used to measure the medullary index of the winter and summer coat on the shoulder and forelimb of Copreolus capreolus. The significant difference test showed that there were significant seasonal differences in the medullary index of the coat, The differences in body parts, that is, the medulla of winter-haired trunk become extremely developed, and the medulla of winter-haired limbs are significantly thinner. The former is the adaptive change in the implementation of the insulation function, the latter is the adaptive change in the implementation of protective functions. Revealed different changes in the medullary index of the hair due to different functions when it adapts to the seasonal changes of the environment