The current treatment for ovarian cancer introduced the improvement of survival rate by the chemotherapy based on cisplatin and maximum debulking surgery. The prognosis of ovarian cancer is affected by various kinds of factor as age, ps, stage, histology, histological grading and the volume of residual tumor. By our analysis it was shown whether tumor diameter is less than 2 cm or not was critical point. On the other hand, dose intensity of cisplatin is also important. We could show the improvement of survival rate of advanced cases by the treatment of maximum debulking surgery and high intensity of cisplatin.