Postpartum hemorrhage is defined as bleeding after delivery of the fetus, which exceeds 500 mL for women who deliver vaginally and 1000 mL for women who deliver by cesarean section. the most common cause of postpartum hemorrhage is weak uterine contractions, which can lead to more vaginal bleeding if the uterus does not contract well after delivery. In addition, retained placenta and fetal membranes, coagulation dysfunction and soft birth canal injury are also common causes of postpartum hemorrhage. If the postpartum bleeding is caused by weak contraction of the uterus, medication to promote contraction of the uterus should be given to treat the bleeding. If the bleeding is caused by retained placenta, the placenta should be removed promptly. If postpartum hemorrhage is caused by coagulation disorders, coagulation needs to be actively corrected. If postpartum hemorrhage is caused by soft birth canal laceration, active suturing is needed.