If bowel cancer is clinically evaluated without spread, it depends on the stage of the cancer to decide whether the patient has a chance of surgery. If the cancer is relatively small, surgery can be done. Post-operative staging, especially for post-operative stage I patients, chemotherapy is usually not done; if the staging is more advanced, stage II or above, post-operative adjuvant chemotherapy is usually done for 6 cycles. If the cancer is relatively large, although it has not spread or metastasized to other organs, but surrounded by important nerves, blood vessels and organs, surgical resection is also more difficult. Before surgery, 2-4 cycles of neoadjuvant chemotherapy should be given, and then surgery should be performed after the tumor shrinks, and 6 cycles of chemotherapy should be given after surgery to achieve the purpose of reducing recurrence and metastasis. Bowel cancer is a tumor with very good prognosis, so patients should try to cooperate with doctors to complete chemotherapy cycles after bowel cancer surgery. Some patients worry about the side effects of chemotherapy and hope to reduce several cycles of chemotherapy, which will affect the prognosis. If the cycle can be completed in full amount and in full course, patients with bowel cancer have a high possibility to live 5, 10 or even 20 years after surgery, so it is recommended that patients should try to cooperate with doctors to complete chemotherapy.