Standardized postoperative review is recommended for early detection of tumor recurrence and metastasis, and early countermeasures can be taken. The review should be done once in 3-6 months after surgery for 2 years, once in 6 months after 2 years for 5 years, and once a year after 5 years. In general, the routine review items are liver ultrasound, chest X-ray, tumor index CEA, CA199, etc. If necessary, enhanced CT of the surgical site will be performed; gastroscopy and colonoscopy will be reviewed within one year, and then once every two to three years.