Abstract: Objective: To analyze the common causes of postpartum hemorrhage and risk factors.Methods: Volume and weighing measurement of postpartum hemorrhage.Summary of the relevant factors of postpartum hemorrhage.Results: The incidence of postpartum hemorrhage was 2.88%,the mortality rate was 1.68%,the uterine atony was 75.63%,15.97% of placental factors,8.14% of soft birth canal injury.The risk factors that can cause postpartum hemorrhage were uterine factors,pregnancy complications,production times and quality of midwifery staff.Conclusions: Post-partum haemorrhage is caused by multiple risk factors,improving the quality of midwifery staff can reduce the occurrence and mortality.