Gastric cancer is a common malignant tumor that threatens people''s lives and health. There were 479 000 new cases of gastric cancer and 374 000 deaths in China in 2020. Gastric cancer is roughly divided into early gastric cancer and advanced gastric cancer according to the development stage. This consensus is led by the Digestive Endoscopy Branch of Chinese Medical Association, with new evidence and views that emerged after the publication of the previous edition. This consensus focuses on the new discoveries and controversial issues in early gastric cancer screening, diagnosis and treatment in recent years by Chinese experts to provide a reference for the standardized diagnosis and treatment for gastric cancer and precancerous lesions, and to improve the prevention and treatment effect of gastric cancer in China.