Regular follow-up is always recommended after colorectal cancer treatment. 1.History and physical examination every 3-6 months for 2 years, then every 6 months for a total of 5 years, and annually after 5 years 2.Monitoring of CEA and CA19-9 every 3-6 months for 2 years, then every 6 months for a total of 5 years, and annually after 5 years 3, Abdominal/pelvic ultrasound, chest X-ray every 3-6 months for 2 years, then every 6 months for a total of 5 years, and annually after 5 years. 4, Abdominal/pelvic CT or MRI once a year. 5.Colonoscopy within 1 year after surgery, if abnormal, review within 1 year; if no polyps are seen, review within 3 years; then once every 5 years, resection is recommended for any colorectal adenoma that appears on follow-up examination. 6.PET-CT is not a routinely recommended examination item.