Postpartum hemorrhage is defined as bleeding of more than 500 ml within 24 hours after natural delivery or more than 1000 ml after cesarean delivery. pregnant women who are prone to hemorrhage are as follows: 1. pregnant women with a history of miscarriage; 2. pregnant women who are highly nervous and emotionally fearful during delivery; 3. pregnant women who use too many anesthetic drugs, improper or excessive use of stimulants; 4. pregnant women with twin pregnancies, excessive amniotic fluid, huge fetuses Pregnant women with a history of postpartum hemorrhage.