When there is blood in stool, change in bowel habit, abdominal mass and abdominal discomfort, stool occult blood, CEA, rectal examination and colonoscopy should be performed as early as possible, so that early detection and treatment can cure part of colorectal cancer. The prerequisite for cure is standardized and complete surgical resection, and quality surgery can at least prolong the tumor-free survival of patients. 3.Standardized perioperative radiotherapy is beneficial, but it is not necessary for every patient. 4. The Department of Colorectal and Anal Surgery of Beijing Jitan Hospital, affiliated with Capital Medical University, aims to provide specialized surgical and other treatment services through a specialized team for the benefit of more patients.