1. In the first 1-2 years after surgery, review every 3-6 months, especially in the first year after surgery. The review items include: blood routine, liver and kidney function and electrolytes, blood CEA, CA-199, ultrasound/CT of abdomen and pelvis, frontal and lateral chest film/CT, and gastroscopy at least once every six months (total gastrectomy is feasible with upper ablation imaging). 2.Studies show that patients with gastric cancer have the most recurrences within 1-2 years after surgery. 3. Regarding the choice of ultrasound and CT, CT is the best choice if the economy allows. 4. Blood CEA and CA-199 values should be compared with the postoperative test values. If the test results are continuously elevated twice in a row in January, the possibility of recurrence should be alerted. 5.After two years, the test is usually repeated once every six months; if there are uncomfortable symptoms, come for review at any time; after 5 years, the chance of recurrence is reduced.