Abstract: Six local nonpregnant dairy goats were used in a self-control design and eight pregnant dairy goats were used in a match design to study the effects of CS on mammary development in dairy goats.The results showed that the alveolar and ductal epithelial of non-pregnant dairy goats in control period were less than that in experiment period.With pregnant processing,the mammary gland of pregnant dairy goats also developed little by little,but the alveolar and ductal epithelial of pregnant dairy goats in experiment group were in abundance in comparison with the control group.As well as CS also enhanced the levels of the related hormone in plasma with mammary gland development.The above results suggested that CS promoted mammary gland development in dairy goats to some extent.