Puerperal infection refers to the infection of the reproductive tract by pathogens during delivery and puerperium, causing local or systemic inflammatory changes. Postpartum hemorrhage is defined as bleeding of more than 500 ml within 24 hours after delivery of the fetus. The onset of postpartum hemorrhage is rapid, and vaginal hemorrhage within a short period of time may lead to shock and endanger life. Pregnancy combined with heart disease is the most serious complication in obstetrics and is one of the four major causes of maternal death, especially during pregnancy, delivery and puerperium, which is the period with the greatest change in systemic blood circulation and the heaviest load on the heart, and heart failure often occurs because the heart cannot afford it. During pregnancy, the blood volume increases by 40% to 50% compared to that of the non-pregnant period, and reaches its peak around 32 to 34 weeks of gestation. Due to the enlargement of the uterus during pregnancy, the diaphragm rises, displacing the heart, increasing the pressure on the right side of the heart, and the large blood vessels bend and flex, all of these factors increase the burden on the heart and can contribute to heart failure, which can endanger the life of the mother in severe cases. Eclampsia is a condition that occurs after 24 weeks of gestation, or during delivery, or within a day or two after delivery, when a pregnant woman suddenly has a straight neck, closed teeth, eyes upward, foaming at the mouth, twitching of the limbs, unconsciousness, and wakes up from a short time, and then relapses.