Abstract: Different proportions of xylo-oligosaccharides were added in the diary feed of broiler ducks to study its effects on the growth performance of meat ducks.Using the single factor fully-random experiment design,200 one-day-old healthy Cherry Valley meat ducks were selected and randomly divided into four groups.There were five repetitions in each group,with each repetition of ten meat ducks.The body weight of meat ducks among different treatments had no significant difference（P0.05）.One control group and three test groups were designed in the test.4 mg/kg flavomycin was added to the basal diet of meat ducks in control group.0.005% xylo-oligosaccharides was added to the basal diet of meat ducks in test Ⅰ group.0.01% xylo-oligosaccharides was added to the basal diet of meat ducks in test Ⅱ group.0.02% xylo-oligosaccharides was added to basal diet of meat ducks in test Ⅲ group.And the raising period lasted 42 days.The results showed that the average daily gain of 1-3 week-old meat ducks in test groups increased than control group to different degrees and there was no significant difference among different groups（P0.05）.The feed-meat ratio in test Ⅱ group decreased and there was no significant difference among different groups（P 0.05）.Compared with control group,the average daily gain of 4-6 week-old meat ducks increased and the feed-meat ratio decreased in test groups and there was no significant difference among different groups（P0.05）.For 1-6 week-old meat ducks（the whole raising period）,the average daily gain of meat ducks in test groups was higher than that in control group and the feed-meat ratio was lower than that in control group,and there was no significant difference among different groups（P 0.05）.All in all,the growth effect of meat ducks in test Ⅱ group was the best.