Abstract: The experiment was conducted to study the effects of Fructooligosaccharide on milk yield, milk ingredient and immune indices in dairy goat, 16 healthy dairy goats in peak milk production with an average weight (48.24±3.45) kg, were randomly allocated to 4 experimental groups with 4 replicates. All treatment groups were fed Fructooligosaccharide in the basal diet composed of 0 g/d(CT), 10 g/d (groupⅠ), 15 g/d (groupⅡ), 20 g/d (groupⅢ) (Effective content). The trial lasted for 70 days, including 14 days of pre-test period and formal trial period 56 days. The results shows that: (1)Compared with control group, groupⅡhad a significant difference in average milk yield gain (P＜0.05), (2)There is no significant differences among groups for milk ingredient (P＞0.05). (3)The levels of IgA, IgM and IgG in groupⅡand groupⅢhad a significant difference (P＜0.05) compare with control group, but differences between them were not significant (P＞0.05). The best effect for the milk yield and immune indices of dairy goat was levels of 15 g/d.