Abstract： Objective:To analyze the effect of epidural labor analgesia time on the anesthesia method of cesarean section.Methods:The clinical data of 1484 pregnant women who underwent epidural labor analgesia in our hospital from January 2022 to December 2022 were retrospectively analyzed.They were divided into epidural anesthesia group and spinal anesthesia group according to different anesthesia methods.Univariate and multivariate analysis were used to analyze the factors of cesarean section anesthesia.ROC curve was made according to epidural analgesia time,and the optimal critical value of epidural analgesia time was determined according to the maximum Youden index.According to this value,pregnant women were divided into long-term epidural analgesia group and short-term epidural analgesia group,and the intraoperative and postoperative conditions of the two groups were compared.Results:Univariate analysis showed that there were statistically significant differences in epidural analgesia time,proportion of catheter displacement,proportion of preoperative artificial rupture of membranes,and preoperative uterine orifice size between the two groups(P<0.05).Multivariate Logistic regression analysis showed that the favorable factor of epidural anesthesia was preoperative artificial rupture of membranes(P<0.05).The favorable factors for spinal anesthesia were epidural analgesia time,catheter displacement,and preoperative large cervix(P<0.05).ROC curve analysis showed that 9.64 h was the optimal critical value of epidural analgesia time,with sensitivity of 0.599 and specificity of 0.906.The risk of spinal anesthesia in the long-term group was 2.805 times that in the short-term group,and the difference was statistically significant(P<0.05).The incidence of intraoperative hypotension in the long-term epidural analgesia group was higher than that in the short-term group,and the difference was statistically significant(P<0.05).Conclusion:Epidural anesthesia and spinal anesthesia are the main anesthesia methods for epidural labor analgesia to transfer to cesarean section.Epidural analgesia time,preoperative artificial rupture of membrane,catheter displacement,and preoperative large cervix can affect the choice of anesthesia methods.Pregnant women with cesarean section whose analgesia time exceeds 9.64 h are mainly spinal anesthesia,and are prone to intraoperative hypotension,so prevention should be done.