近年来 ,随着对排便生理和肠癌病理进一步的了解及直肠端端吻合器的应用 ,人们对癌肿不仅要求根治而且对生存质量要求越来越高。因永久性人工肛门给病人带来生活不便 ,生存质量差 ,再者我国直肠癌发病特点是中低位直肠癌较多 ,中青年发病率较高〔1〕。肿瘤下缘位于腹膜反折以下 In recent years, with the further understanding of defecation physiology and pathology of colorectal cancer and the application of recto-end stapling devices, people are not only required to cure cancer but also have higher and higher quality of life. Because the permanent artificial anus brings life inconvenience to the patient, the quality of life is poor. In addition, the incidence of rectal cancer in China is characterized by more middle and low rectal cancers, and the incidence rate of young and middle-aged people is relatively high[1]. The lower edge of the tumor is below the peritoneal plication