Abstract: Objective: To evaluate the diagnosis and treatment of the placenta accreta on the postoperative scar after previous caesarean section in late pregnancy. Methods: A retrospective study was conducted in 9 cases with placenta accreta on the postoperative scar after previous caesarean section in late pregnancy from Jan. 2000 to Jul. 2010. Results: Five cases were performed termination of pregnancy after conservative treatment during 32-35 weeks pregnancy and 4 cases were performed cesarean section after adequate preoperative preparation. All the 9 cases suffered from postpartum hemorrhage. One case with placental adherence underwent uterine artery ligation,and the other 6 cases with placenta accreta and 2 cases with placenta percreta received hysterectomy. No death occurred in the pregnant or lying-in women. Premature birth was observed in 5 infants and full term birth in 2 infants; perinatal deaths occurred in 2 infants. Conclusions: Accurate diagnosis and effective therapeutic procedure are essential for treatment of placenta accreta on the postoperative scar after previous caesarean section in late pregnancy.