【Abstract】 Objective To investigated the effect of balloon occlusion of the abdominal aorta in pernicious placenta previa cesarean section（CS) 。Methods 78 pregnant women delivered in Chengdu Women and Children Center Hospital from November 10, 2012 to November 10, 2016 diagosised pernicious placenta previa after cesarean section were divided into A group (47 cases) and B group (31 cases). A group was treated with abdominal aorta balloon occlusion method for caesarean section. B group was treated with conventional cesarean section. Based on the separation of the placenta from the uterine wall, A group and B groups were divided into normal separation group (A1 group and B1 group), placenta accreta group (A2 group and B2 group) and placenta increta group (A3 group and B3 group). The intraoperative situations of the groups were compared. The positions of the uterine wall of placenta attached including front wall, back or side wall, back and front wall) were compared.Results A3 groups intraoperative blood loss, blood loss within 24h postoperative were significantly reduced. The incidence rate of DIC, the percentage of uterus resection of A3 group were obviously reduced compared with those in B3 group (P < 005). The intraoperative blood loss, blood loss within postoperative 24h, incidence of DIC, the percentage of uterus resection placenta attached to the front wall of the uterus were more significantly increased than that of back or side wall, front and back wall.Conclusion The balloon occlusion of the abdominal aorta in pernicious placenta previa and placenta increta cesarean section can obviously reduced the risk of bleeding and lower hysterectomy,this operation is suitable for clinical application; placenta implanted or not and the placenta adherent part are key determinants of hysterectomy or not.