Objective:To analysis clinical features of pernicious placenta previa.Methods:We retrospectively analyzed 25cases of pernicious placenta previa who dilveried in our hospital.Results:The average age is 32.8 years (SD3.4). Mean time between previous cesarean section and pregnancy was 5.4(SD2.9) years.Placenta accreta 14cases(56.0%), postpartum hemorrhage 20cases(80.0%),hysterectomy 11cases(44.0%).An average of 35.6 weeks gestational age at delivery (SD2.8).The average blood loss was 2.6(SD4.0) L.Al women survived.One fetal death.Conclusion:Pernicious placenta previa highly suspected placenta increta,should be ful y prepared before cesarean, active treatment,made a hysterectomy if necessary.