本文对７例乳腺癌根治性手术后大出血的病例进行了分析，发现出血原因多与术后引流管负压、拔管时间、加压包扎程度及拆开时间等有关。术后大出血可危及病人生命、增加医源性肿瘤的播散及伤口感染的机会，应尽量避免出血发生，一旦出现，应紧急处理。 This article analyzed the cases of 7 cases of radical bleeding after radical mastectomy. It was found that the causes of bleeding were related to the negative pressure of the drainage tube, the time of extubation, the degree of pressure dressing, and the disassembly time. Postoperative bleeding can endanger the life of the patient, increase the spread of iatrogenic tumors and the chance of wound infection. Hemorrhage should be avoided as soon as possible and should be treated as soon as possible.