I. Objective Lateral perineal incision is very common in obstetrics, and even has a trend of popularity. Lateral perineal incision can cause pain and restricted movement after delivery, etc. If the incision does not heal well, it can cause maternal psychological burden and also increase the economic burden. Second, implementation of the results Reasons for poor incisional healing, incisional infection in patients with poor healing after analysis, after the removal of stitches, the surface of the fissure is eroded, fresh tissue is not visible to the naked eye, the main causative factors of infection include prenatal severe anemia, vulvovaginal infection, postpartum resistance reduction, premature rupture of fetal membranes, prolonged labor, vaginal assisted delivery, etc.; perineal local hematoma, skin and subcutaneous tissues are found to be split, there are blood clots at the incision; poor absorption of intestinal thread When the stitches were removed, it was seen that the skin and subcutaneous tissues were separated and there were unabsorbed sutures; poor alignment of tissue levels, the perineal navicular fossa was not aligned, and the malodorous dew at the wound was stagnant, which was not conducive to the healing of the incision; overly dense sutures obstructed the local blood flow of the perineum, and too many sutures increased the foreign body of the thread, which also obstructed the blood flow and subsequently caused liquefied necrosis; liquefied necrosis of tissues, unreasonable postpartum diet of the mother, low intake of coarse fibers, coupled with The postpartum diet is unreasonable, the amount of coarse fiber eating is low, coupled with bed rest, incision pain reflex, etc., it is easy to have constipation, and forceful defecation makes the wound open again. The necessity of lateral perineotomy is a surgical operation for the smooth birth of the fetus, that is, an oblique incision is made in the perineum. In addition to the physiological reasons, the deeper problem is the backward lifting system. If the perineum is torn due to the failure to perform the lateral incision, the hospital can be held responsible for the failure to perform the lateral incision when the mother files a lawsuit. Therefore, in mainland China, there is a tacit agreement in public hospitals to practice lateral incision for normal delivery in order to avoid unexpected situations [2]. The area between the labia and the anus is the perineum, which is usually only 2-3 cm, but can be stretched to about 10 cm during labor. this is due to the hormonal stretching of the perineum to aid in the birth of the fetus. Stretching the perineum is relatively difficult during the first delivery. A lateral perineal incision is an oblique incision made in the perineum. Episiotomy includes not only a lateral incision, but also a median incision, which prevents maternal perineal tearing, protects the pelvic floor muscles, and the surgical incision is easily repaired and heals better. However, there is no lack of clinical cases of poor healing of perineal incision after delivery. A variety of factors may lead to poor healing of the incision, mainly due to incision infection, local hematoma, poor absorption of intestinal thread, misalignment of tissue levels and poor suturing. 2.Improve midwifery technique and suture technique before midwifery should be strictly aseptic, change sterile gloves before suturing, disinfect vulva again, spread sterile towel, rinse and disinfect perineal incision, avoid touching anus. The sutures should also be aligned at the level of the incisional tissue without leaving a dead space. To reduce the thread knot reaction, the first stitch of the vaginal mucosa should be ≥1 cm beyond the vertex, and the stitch spacing should not be too dense to obstruct blood flow or too sparse to achieve hemostasis. The sutures for the hymen and navicular fossa should be anatomically repositioned. At the same time, the size of the incision should be determined according to perineal conditions when lateral perineal incision is made to avoid serious lacerations. 3, strengthen postpartum care after delivery to closely observe the maternal condition, body temperature, wound situation, if there is an infection to prevent in time. The nursing staff should regularly clean and disinfect the perineum, scrub the vulva with iodophor 2 times/d, and rinse off the residual blood on the incision. Pay attention to diet regulation, eat light, easily digestible high vitamin, high protein food, increase nutrition and prevent constipation. 4.Health preaching Repeated health preaching to the mother during the perinatal period. Advise the mother to keep her mood relaxed, pay attention to rest, reasonable diet, ensure nutrition and sleep. Teach mothers to learn self-care, such as timely changing of perineal pads, healthy side lying, keeping perineum dry, etc. Explain to mothers the high-risk factors for poor perineal incision healing and actively avoid these high-risk factors in the postpartum period. For those who have already developed incisional dehiscence, first stabilize their emotions and identify the causes for symptomatic care, such as sitz bath with potassium permanganate disinfection solution and infrared local irradiation. The main causes of poor perineal wound healing after delivery are wound infection, local hematoma, poor suturing, and lateral incision laceration, etc. Strengthening perinatal care and improving midwifery techniques can effectively improve the wound healing rate and reduce maternal pain.