Datas of 515 Yorkshire sows including age at puberty and age at first mating as well as reproductive performance including total number born(TNB), number born alive(NBA), number healthy piglets(NHP), number born weak(NBW), number born stillbirths(NBS), number born mummies(NBM), number born deformities(NBD) and litter birth weight(LBW) were collected. These datas were grouped according to age at puberty(≤180 d, 181-200 d, 201-220 d, ≥221 d) and age at first mating(≤240 d, 241-270 d, ≥271 d) to comparatively analyze the reproductive performance of sows with first parity in different groups. The results showed that the TNB, NBA, NHP, and LBW of sows with age at puberty ≤180 d were significantly better than those of other sows. Sows with age at puberty ranging from 201-220 d showed the lowest reproductive performance. The reproductive performance of sows with age at first mating ≤240 d is significantly better than that of sows with other mating times. The correlation coefficient between age at puberty and the age at first mating was 0.77(P<0.001), with regression model Y=0.66X +104.48, where X is age at puberty and Y is age at first mating, and the calculated coefficient of determination R2 was 0.592. The traits of first parity indicated Yorkshire sows with early estrus showed good reproductive performance, and the sows showed good reproductive performance at the first parity when the initial mating age is between 210-240 days. In actual production, the information of puberty can be used to make plans for the first mating of sows and improve the production efficiency.