Objective To explore the effect of different time limits of active period on the maternal and infant outcomes under the new labor management model.Methods Retrospective analysis of the clinical data of 360 full-term primiparas treated to the department of obstetrics and gynecology in our hospital from July 2018 to July 2019.Grouped according to the different active periods, 180 pregnant women with active period <4 h were included in the control group,and another 180 pregnant women with active period ≥4 h were included in the observation group.The perioperative indicators, the Apgar scores at 1 minute and 5 minutes after delivery, the pregnancy outcomes and complications were compared between the two groups.Results The maternal postpartum hemorrhage volume in the observation group was lower than that in the control group, and the total duration of labor was longer than that in the control group, the differences were statistically significant (P＜0.05).There were no significant differences in the Apgar score of newborns between the two groups 5 minutes after delivery and 1 minute after delivery (P＞0.05).The rate of maternal conversion tocesarean section in the observation group was lower than that in the control group, and the difference was statistically significant (P＜0.05).There was no significant difference in the incidence of amniotic fluid fecal infection and neonatal asphyxia between the two groups (P＞0.05).Conclusion The new labor management mode takes the active period ＞4 h as the treatment time limit to allow the pregnant women to have sufficient time for trial delivery, reduce the cesarean delivery rate, improve the perioperative index, and benefit the prognosis of the pregnant women.It is recommended of clinical application.