目的探讨对侧胸肌筋膜瓣在扩大乳癌根治术中的应用及其表面植皮情况。方法对于扩大乳癌根治术患者肋软骨及肋间组织的缺损采用翻转对侧胸肌筋膜覆盖修复，对皮肤缺损患者在筋膜表面中厚植皮。结果６例手术患者，植皮均成活，２例Ｉ期愈合，４例Ｉ期愈合。结论胸肌筋膜瓣修补缺损，不仅手术简单，而且不增加手术创面，明显提高植皮成活率。 Objective To investigate the application of the contralateral pectoral myofascial flap in the radical mastectomy and its skin grafting. Methods To enlarge the defects of costal cartilage and intercostal tissue in patients undergoing radical mastectomy, the contralateral pectoral muscle fascia was used to cover and repair, and the patients with skin defects were thickly skin grafted on the fascial surface. [Results] All 6 cases had skin grafting, 2 cases healed in phase I and 4 cases healed in phase I. Conclusion The thoracic myofascial flap repair defect is not only simple, but also does not increase the surgical wound and significantly improves the survival rate of skin grafting.