Uterine right rotation means the uterus rotates backward to the right, due to the anatomical relationship of the left lower abdominal sigmoid colon and rectum, the normal female uterus is usually not in the center of the body, but slightly to the right, which can be diagnosed under color ultrasound. With the increase of pregnancy weeks, especially in late pregnancy, more than 80% of pregnant women, the uterus will be rotated to the right to varying degrees, but the angle of rotation is usually not more than 30 °, usually asymptomatic. It is recommended that pregnant women in the second trimester try to rest in the left lateral position, so that the right rotation of the uterus to the left side of the shift, to improve and correct the degree of right rotation of the uterus, not only can reduce uterine vascular tension, increase placental blood flow, improve fetal oxygenation, but also reduce the uterus on the inferior vena cava and aorta compression, thereby alleviating lower extremity edema. However, it is not necessary to sleep in the absolute left lateral position.