目的　探讨剖宫产术后晚期产后出血发生的时间、病因及防治措施。方法　对 1999～ 2 0 0 2年 4 6例剖宫产术后晚期产后出血的临床资料进行回顾性分析。结果　发病原因依次为 :子宫切口感染、溃疡 ,子宫复旧不良 ,胎盘、蜕膜残留 ,子宫内膜炎。发生时间以剖宫产术后 3周以上者占多数 (78 3% ) ,部分病例 (36 9% )在 6周以上。结论　剖宫产术后晚期产后出血的时间不应局限于产褥期内 ,其主要病因是子宫切口感染、溃疡。对病因的诊断、防治值得重视。 Objective To investigate the time, etiology and prevention and treatment of late postpartum hemorrhage after cesarean section. Methods The clinical data of 46 cases of postpartum hemorrhage after cesarean section in 1999 ~ 2002 were analyzed retrospectively. Results The causes were as follows: uterine incision infection, ulcers, uterine involution, placenta, decidua, endometritis. Occurring in more than 3 weeks after cesarean section accounted for the majority (78 3%), in some cases (36 9%) in more than 6 weeks. Conclusion The time of postpartum hemorrhage after cesarean section should not be confined to the puerperium period. The main cause of postpartum hemorrhage is infection and ulcer of uterine incision. The diagnosis of the cause, prevention and treatment worthy of attention.