Abstract: To investigate the feeding effect of dietary supplementation of soybean hull on breeding sows, a total of 36 multiparous and pregnant sows were randomly allocated to four groups： three experimental groups with dietary supplementation of soybean hull at 4% （experimental group 1）, 8% （experimental group 2） or 12% （experimental group 3） and one control group without soybean hull supplementation. The indicators associated with reproductive and productive performance of the experimental breeding sows were statistically evaluated. The results showed that no statistical difference in average feed intake was observed between various groups during the lactation period （P〉0.05）; the reproductive performance was found significantly improved in experimental group 1 and experimental group 2 compared to the control group, and the experimental group 2 performed best in reproductive performance, backfat thickness and body weight. Compared to the control group, the average litter size, average litter birth weight, weaning survival rate, and average litter weaning weight of experimental group 2 were increased by 0.7, 0.83 kg, 2.33%, and 12 kg, respectively, and the inter oestrual period, backfat thickness during the lactation period, and average weight over the whole reproductive cycle were reduced by 2 days, 5.0 mm, and 12 kg. Our results suggest that the optimal dietary supplementation level of soybean hull to pregnant sows is 8%.