Abstract: To improve the sow reproductive performance, a large-scale pig farm in Yulin was taken as an example, reproductive records of breeding sows were measured and analyzed based on field survey. The measurement data were compared to get systematic reproductive index. The results showed that oestrus fecundation rate, parturition rate, average total number of piglet, average number of piglet born alive, survival rate in the delivery room were 86.47%, 80.64%, 9.80, 9.16, 61.90%, respectively, in 2013. Reproductive performance of different varieties showed differences. Average total number of piglets, average number of piglets born alive and the number of weaned piglets of ‘Landrace’ were all the highest, followed by that of ‘Large White’ and ‘Duroc’. Average total number of piglets and average number of piglets born alive of ‘Landrace’ showed significant differences from that of ‘Duroc’ (P<0.05), but no significant difference from that of ‘Large White’ (P>0.05). Number of weaned ‘Landrace’ showed significant differences from that of ‘Duroc’ (P<0.01), but showed no significant difference from that of ‘Large White’ (P>0.05). Reproductive performances in different parities were different. Average total number of piglets and average number of piglets born alive were the most in the third parity and were extremely and significantly different (P<0.01) from the ninth parity which had the least values. Reproductive performances were different in different months. Average total number of piglets and average number of piglets born alive were the highest in April and the lowest in November. Difference of the two index in the two months was significant (P<0.05). Average number of healthy piglet was the highest in April and May and was the lowest in March, and their difference was extremely significant (P<0.01). Reproductive performance of sows in the farm was relatively bad. Varity, parity, farrowing month and disease could affect reproductive performance. And the impact of disease was relative large.