Supine hypotension syndrome occurs mostly in pregnant women in late pregnancy, when the pregnant woman is in the supine position, dizziness, nausea, vomiting, rapid heartbeat, chest tightness and varying degrees of blood pressure drop, the pregnant woman is asked to change the position to the side of the position of the discomfort after the symptoms are relieved. The causes of this disease include: 1) cardiovascular dysfunction due to neuromodulation during late pregnancy; 2) the uterus presses on the inferior vena cava as the fetus grows, leading to a decrease in the return of blood to the heart, a decrease in cardiac output, and a decrease in blood pressure; 3) the enlarged uterus may press on the vagus nerve, resulting in a slowed heart rate and vasodilatation due to vagal nerve excitation. The main treatment is to ask the patient to change the position to left lateral lying position to reduce the compression of the uterus on the inferior vena cava, and the rapid infusion of fluids into the upper extremity veins can be prioritized to prevent the emergence of supine hypotension syndrome in cesarean delivery.