Clinically, there is no clear statistics on the survival period of sigmoid colon cancer stage III. Generally, there is a 30% to 50% 5-year survival period for sigmoid colon cancer stage III. In patients with stage III sigmoid colon cancer, the cancer cells have begun to spread a lot in the body, and they have missed the best treatment period, and cannot be cured by ordinary treatment. However, with timely surgical treatment, active chemotherapy or targeted therapy, and regular rechecking, generally there can be 30%-50% of 5-year survival period. After surgery, patients with stage III sigmoid colon cancer should follow the doctor’s instruction, do a good job of wound disinfection treatment to prevent infection, and pay attention to observing the change of their own body temperature. They should not do physical labor within 3 months after operation, develop good living habits, avoid sitting for a long time, and eat more easily digested and easily absorbed food. Patients are advised to maintain an optimistic mood at all times, and go to the hospital regularly to review the recovery situation.