随着口腔颌面肿瘤外科的发展，能够通过手术方法切除的瘤体越来越大，手术范围越来越广，势必使大面积颌面缺损的同期修复，显得日趋重要，胸大肌肌皮瓣以其解剖位置恒定．表浅，切取容易，旋转弧大，所带肌肉量多及覆盖面广，而得以大量应用。近年来，功能性外科成为一种新趋 With the development of oral and maxillofacial oncology surgery, the number of tumors that can be surgically excised by surgery is larger and larger, and the scope of the surgery is wider and wider. It is bound to make the simultaneous repair of large-scale maxillofacial defects more and more important. Pectoralis major myocutaneous Flap with its anatomical position is constant. Superficial, easy to cut, large rotating arc, with a large amount of muscle mass and coverage, and to a large number of applications. In recent years, functional surgery has become a new trend