Postpartum hemorrhage is an obstetrical emergency, and it is a major cause of maternal morbidity. Since the unified diagnostic criteria of postpartum hemorrhage is lacking, the incidence rate of postpartum hemorrhage varies widely in various regions. The most common cause of postpartum hemorrhage is uterine atony. Every pregnant woman has the possibility of postpartum hemorrhage. In recent years, the incidence of refractory severe postpartum hemorrhage caused by placenta disease is increasing, the clinicians should pay attention to it.