When a woman is about to give birth, she can prevent perineal incision and tear by local muscle exercise and observing the suitability of the fetus for labor, and the midwife can protect her from injury by perineal support. 1. Local muscle exercise: before labor, women can do anal lifting exercise to make the muscles of perineum more elastic, so as to prevent the occurrence of lateral incision and tearing. 2. Observe whether the fetus is suitable for normal delivery: Before delivery, we need to evaluate the fetus to determine whether it is suitable for normal delivery. If the head of the fetus is large and the woman’s pelvis is small, then we need to use cesarean section to prevent perineal incision and tearing. 3. Perineal support: During labor, the midwife will protect the perineum to increase its cushioning capacity and prevent side cuts and tears. Women should seek medical advice and intervention before labor to prevent perineal injury.