Abstract: Danish Landrace (D- Landrace) sows’ Reproductive Traits (the number of living newborn piglets, the weight of a nest of newborn piglets, the average weight of newborn piglets, the number of weaned piglets, the average weight of 28-day old weaned piglets, total number of farrowed piglets, the weight of a nest of 28-day old weaned piglets) were analyzed with Path analysis and regression analysis in the paper. The results showed that each reproductive trait had various degrees correlation with the other, the biggest correlation coefficient appeared in the relationship of the total number of farrowed newborn piglets and the number of living newborn piglets. The four factors, the number of living newborn piglets, the number of weaned piglets, the weight of a nest of newborn piglets and the average weight of 28-day old piglets had remarkable effect on the weight of a nest of weaned 28-day old piglets. Based on above, in order to estimate the weight of a nest of weaned 28-day old piglets, the best regression mode was established as follows: y=-40.2415+1.4332X1+1.1342X2+4.0760X4+5.4210X5。