The aim of this study was to investigate effects of different doses of glucose in daily feed on estrus rateand estrus interval days of weaning sows by increasing the concentration of blood insulin levels in short time peri-ods. A total of 410 weaning sows were chosen from 640 British Large White sows with the close parity. Then theywere randomly divided into 3 experimental groups（group 1, group 2 and group 3） with 5 replicates. Control group in-cluding 230 weaning sows as group 4. The sows in group1, group2 and group3 were fed on diets containing differentdoses of glucose（200 g, 600 g and 1 000 g） while sows in group 4 were fed on basal diet. The results showed that theestrus rate of group 1, group 2, and group 3 were 89.86%, 93.6%, 93.7%, respectively. Estrus interval were 5.83 d,5.06 d, 5.08 d, respectively. The estrus rate of control was 89.39% and estrus interval was 5.89 d. The estrus rate ofand estrus interval of group 1 was improved compared with that in group 4, but no significant difference（P＞0.05）was observed between them. The estrus rate and estrus interval days of group 2 and group 3 were significantly im-proved compared with group 4（P＜0.05）. There was no significant difference between group 2 and group 3（P＞0.05）.These results revealed that adding appropriate doses of glucose in daily feed could significantly improve estrus rateand shorten estrus interval days of weaning sows. Moreover, the optimal dosage of glucose was 600 g, and it could beworthy recommended in pig production to reduce costs and improve the reproductive performance of weaning sows.