Objective:To investigate the effect of different placental attachment position of placenta on the pregnancy outcome of placenta previa. Methods:Retrospectively reviewed and analyzed the clinical records of 234 patients with pernicious placenta previa diagnosed in The People′s Hospital of Guangxi Zhuang Autonomous Region between December 2017 and April 2021. According to the different placental attachment positions, the patients with pernicious placenta previa were divided into three groups, group Ⅰ (86 patients): placenta previa with posterior lateral wall anterior growth, group Ⅱ (126 patients): placenta previa with anterior wall downward growth, groupⅢ (22 patients): placenta previa with cervical external orifice infiltration. The differences of intraoperative blood loss, hysterectomy rate, length of operation time, incidence of placenta accreta and postoperative hospital days were compared among group Ⅰ, group Ⅱ and group Ⅲ . Results:In terms of intraoperative blood loss, length of operation time, postoperative hospital days, incidence of placenta accreta and hysterectomy rate, group Ⅲ was significantly higher than groupⅠand groupⅡ (P<0.05). In terms of hysterectomy rate, group Ⅱ was significantly higher than groupⅠ (P<0.05). Conclusions:The placental attachment position with pernicious placenta previa is correlated with pregnancy outcome. In patients with dangerous placenta praevia, the pregnancy outcome of the invasive placenta extrauterine cervix was poor. [ABSTRACT FROM AUTHOR]