The decision of whether to make a lateral incision during labor should be based on the mental state of the pregnant woman, the size of the fetus, the birth canal, labor force, and the level of labor assistance. If there is no cephalopelvic disproportion and fetal distress, if the labor force is good, try not to make a lateral incision and avoid perineal laceration, the key points are as follows: 1. instruct the pregnant woman to master the skills of labor force, do not force before the opening of the uterus is complete, force during contraction after the opening of the uterus is complete, force from small to large, gradually increase the force, do not use violent force. 2. the midwife should master the timing of labor, control the speed of delivery after the fetal head is exposed, let the fetal head gradually descend and the perineum fully dilate. 3. 3.Before the fetal head is delivered, ask the mother to hold her breath and push before the contraction is about to start, do not push or gently push during the contraction, ask the mother to open her mouth and breathe when the fetal head is delivered, do not push, let the fetal head slide out naturally, and then ask the mother to push gradually after the fetal head is delivered to deliver the fetal shoulder and fetal body.