The mucous membrane at the entrance to the vagina is torn and bleeding due to external force. It is a severe trauma to the soft tissues between the anus and external genitalia, resulting in a visible tear in the perineum that is partially puffed up and thinned, and can be severe enough to tear into the anus. So, how to prevent mucosal tears at the entrance of the vagina? The following are preventive measures for vaginal entrance mucosal tears: 1. Encourage planned women to participate in more physical exercise and physical activities before pregnancy to enhance skin muscle elasticity and prevent overweight. 2.Strengthen prenatal health education and general awareness of childbirth. Change the traditional focus on prenatal examination and delivery of purely biomedical factors, the psychological counseling, guidance, popularization of maternity knowledge into the obstetric work procedures, to help women eliminate fear, anxiety, impatience and other adverse psychological, to the best psychological state to wait for delivery, turn passive initiative to make delivery natural, normal, healthy completion. 3.Actively prevent and treat obstetric complications during pregnancy, pay attention to the prevention and early treatment of vulvovaginal and vaginitis, and strengthen the education of perineal self. 4.If the fetus is found to be large during the examination of pregnancy or if a huge baby was delivered in the past, the pregnant woman should be checked to see if she has. If the pregnant woman is diabetic, she should be treated actively, and after 36 weeks of pregnancy, according to the maturity of the fetus, placental function check and diabetes control, the delivery should be induced or cesarean section should be performed at a later date. 5. During the labor and delivery examination, pregnant women with normal pelvis, fetal weight estimated to be less than 4,000g and who are in a position to deliver naturally should be instructed to do anal lifting exercises 1 to 2 weeks before the expected delivery date, 1 to 2 times a day for 5 to 10 min each time.