Objective To explore the effects of admission time to delivery room based on the expert consensus on new labor standards and treatment on delivery outcome and labor duration in low-risk primiparous women. Methods A total of 401 primiparous women were enrolled in the retrospective cohort study, who were then divided into three groups according to the dilatation of the cervix at the admission time to the delivery room after labor:those with the dilatation of the cervix ＜3 cm was group A （n=207）, those with 3 cm or more but less than 6 cm was group B （n=132）, and the left with 6 cm or more was group C （n=62）.The clinical basic conditions, delivery outcomes and the labor duration among the three groups were compared.The logistic multivariate regression analysis was conducted to analyze the effect of different admission time to the delivery room on the delivery outcomes.Then the Kaplan-Meier method was used to draw the labor duration curve of the three groups, and Cox multivariate regression analysis was conducted to analyze the effect of different admission time to the delivery room on labor duration. Results There were significant differences in neonatal birth weight, Cesarean section rate, the use rate of oxytocin during labor, and the rate of painless de-livery among the three groups (all P＜0.05).The logistic multivariate regression analysis indicated that, the rates of Cesarean section, use of oxytocin during labor and painless delivery in group B and C were significantly lower than those in group A as a control (all P＜0.05).There were significant differences in the first-stage labor duration and the total duration of labor among the three groups （both P＜0.05）, and when compared between each two groups, group A ＞ group B ＞ group C （all P＜0.05）.The Kaplan-Meier curve showed that, the different admission time to the delivery room had effects on the first-stage labor duration and the total duration of labor （all P＜0.05）, when taking group A as a control, the multivariate Cox regression analysis indicated that, the HR （95%CI） of the first-stage labor duration in group B was 1.527 （1.191,1.958）,P＜0.05, and which was 5.230 （3.711,7.370） in group C, P＜0.05; the HR （95%CI） of the total duration of labor in group B was 1.410 （1.102,1.804）,P＜0.05, and which was 4.367 （3.118,6.118） in group C, P＜0.05. Conclusion Based on the expert consensus on new labor standards and treatment, low-risk primiparous women admitting into the delivery room at the time of cervix dilatation ≥6 cm can reduce unne-cessary obstetric medical intervention, shorten the duration of labor, and decline the rates of painless delivery, use of oxytocin and Cesarean section.