The prognosis of gastric cancer is not related to the extent of gastric resection, but needs to be related to the specific stage, treatment and individual patient’s condition. The prognosis of gastric cancer is related to the clinical stage, histological typing, biological behavior and treatment methods of gastric cancer, and has little relationship with the scope of surgical resection of gastric cancer. The prognosis of early gastric cancer is better if it is promptly treated with comprehensive treatment based on surgery, while the prognosis of progressive gastric cancer is relatively poor. For example, the 5-year survival rate of stage I gastric cancer can reach 85% after standardized treatment, while the 5-year survival rate of stage IV gastric cancer can only reach about 2% after timely and active treatment. Therefore, early detection, early diagnosis and early treatment are the keys to the treatment of gastric cancer. Patients with family history of gastric cancer, history of gastric ulcer and other high-risk factors are recommended to have regular gastroscopy in gastroenterology department for early treatment after detection of gastric cancer.