目的探讨原因未明上消化道大出血术中寻找出血灶的方法及其处理问题。方法总结７１例病人的临床资料，分析不同时期采用不同探查方法的诊断和治疗结果。结果本组总的病因诊断率为９３０％，止血率为８８７％，治愈率为８０３％，病死率为１９７％。１９８８年之后，由于采用了术中胃镜和分段冲洗法，获得了较满意的诊断和治疗结果。结论术中胃镜和分段冲洗法，有助于正确判断出血的原因和部位，也有助于选择适当的手术方式。 Objective To investigate the reasons for unknown upper gastrointestinal hemorrhage surgery to find the method of bleeding and treatment problems. Methods The clinical data of 71 patients were summarized and the results of diagnosis and treatment of different probing methods were analyzed. Results The total etiological diagnosis rate was 930%, the rate of hemostasis was 887%, the cure rate was 803%, and the mortality rate was 197%. After 1988, due to the use of intraoperative endoscopy and segmented irrigation method, obtained more satisfactory diagnosis and treatment results. Conclusion Intraoperative gastroscopy and staged irrigation method, help to correctly determine the cause and location of bleeding, but also help to select the appropriate surgical approach.