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. Do prenatal education and guide the pregnant women and mothers to use abdominal pressure and deep breathing exercises correctly during delivery to prevent the fetus from being delivered too quickly. 2. A vaginal examination should be done in early pregnancy to detect abnormalities in the soft birth canal, such as old vaginal scars, vaginal diaphragm and vaginal mediastinum. 3, the midwife must be familiar with the delivery mechanism, carefully observe the progress of labor, and correctly protect the perineum. For example, if the child is delivered in the occipital position, when the cranial roof of the child’s head is exposed, the fetal head should first be made to take a prone position, so that the occipital bone is delivered first. When the occipital bone is exposed, the child’s head should be in a supine position so that the child’s head can be delivered with the smallest diameter, i.e., the circumference of the inferior occipital fontanelle. 4.If the perineal body is too long, too tight, too thick, too solid and lack of stretching, the perineal body has obvious edema. In order to avoid tearing the perineal incision upward, downward or to the side, a longer incision should be made in the mucosa, submucosal connective tissue and muscle of the vaginal opening. For those with more severe scarring vaginal stenosis, early cesarean section may be considered to end the labor. In addition, high forceps and difficult intermediate forceps are prone to maternal and pediatric complications such as soft birth canal injury and intracranial hemorrhage in the newborn, and should be avoided in favor of cesarean delivery.