Whatever the indication of operation is, the mother`s health state is very serious when emergency explo-laparotomy is required relating to delivery. Therefore, momentary judgement of right operation time, reduction of operating time and selection of suitable operating method are very important when emergency explolaparotomy is performed. This study was carried out on 79 subjects who underwent emergency hysterectomy at Department of Obstetrics and Gynecology, 9 affiliated hospitals to CMC from 1975 to 1984. The indication of operation, length of operating time and postoperative complications were analysed and the following results were obtained. 1. The indication of emergency hysterectomy was 30.4% in uterine atony, 27.8% in uterine rupture, 19.0% in placenta acreta and 7.6% in sepsis. 2. No significant difference in length of operating time, amount of blood loss and operative complications was found between total abdominal hysterectomy and subtotal abdominal hysterectomy. 3. Maternal death was found in 7 cases and main cause of death was uterine rupture in 3 cases, sepsis in 2 cases and uterine atony in 2 cases. 4. Main cause of uterine rupture was found in previous classic Cesarean section(54.5%) and its mean gestational weeks was 37.2 weeks. 5. Etiologic factors for placenta acreta were previous Cesarean section, placenta previa and excessive previous abortion history. 6. The frequency of total hysterectomy was on in every 1250 deliveries and total hysterectomy was performed in 79 cases among total 98,739 deliveries.