Objective To explore the efficiency of oxytocin combined with carboprost tromethamine in treatment of postpartum hemorrhage in cesarean section with scarred uterus.Methods 48 patiens with scarred uterus received：cesarean section in our hospital from March 2015 to February 2017,and were randomly divided into the control group and the treatment group,with 24 cases in each group.The control group was given oxytocin alone,while the treatment group was given oxytocin combined with carboprost tromethamine.The incidence of postpartum hemorrhage,the amount of postpartum bleeding at different tima,in both groups;postpartum bleeding at different times,duration of postpartum hemorrhage between two groups were compared.Results The incidence of postpartum hemorrhage in the treatment group(25.00%) was lower than that in the control group(50.00%);2,24 h after operation,the amount of postpartum bleeding in the treatment group[(223.51±31.48),(292.51±52.61)ml]were less than those in the control group[(294.39±52.77),(387.39±63.57)ml]; the duration of postpartum hemorrhage in the treatment group[(2.62±1.21)d]was shorter than that in the control group [(3.61±1.59)d],and all the differences were statistically significant(P＜0.05).Conclusion The effect of oxytocin combined with carboprost tromethamine on the prevention of postpartum hemorrhage is effective in reducing the incidence of postpartum hemorrhage,reducing the amount of postpartum hemorrhage and shortening the duration of bleeding.It is worthy to be popularized.