会阴Ⅲ度裂伤是经阴道分娩的并发症 ,多发生于初产妇 ,主要为胎儿娩出过快 ,会阴发育差 ,胎儿过大而未做侧切者以及产妇耻骨弓低 ,耻骨弓角度 <90°等因素。通过对 17例会阴Ⅲ度裂伤进行分析总结 ,认为一旦发生裂伤应及时修补缝合 ,并积极抗感染治疗 ,否则可导致伤口裂开 ,感染 ,大便失禁 ,直肠阴道瘘等并发症 ,应予重视 ,积极预防其发生 Perineal third degree laceration is a complication of vaginal delivery, occurred in primipara, mainly for the fetus delivered too fast, poor perineal development, fetus is too large but not the side of the patient and the pubic symphysis is low, pubis arch angle <90 ° And other factors. Through the analysis of 17 cases of perineal Ⅲ degree laceration, it is concluded that in the event of laceration, the suture should be promptly repaired and active anti-infective treatment can lead to complications such as wound dehiscence, infection, fecal incontinence and rectovaginal fistula, Pay attention to actively prevent its occurrence