The endoscopic classification of chronic atrophic gastritis is closed atrophy and open atrophy, with closed atrophy represented by C and divided into C1, C2, and C3 segments, and open atrophy represented by O and divided into O1, O2, and O3 segments. C1 means that the lesion is confined to the gastric sinus, C2 is atrophy beyond the gastric angle and invades the lesser curved side of the gastric body, and C3 is The C3 segment is a moderately severe heterogeneity that may transform into gastric malignancy. C1 and C2 segments are relatively mild heterogeneous changes that belong to the initial atrophy of the glands in the stomach, but they should be taken seriously to prevent the progression of the disease and the occurrence of cancer. Patients should be given comprehensive treatment such as protection of gastric mucosa and anti-H. pylori under the guidance of doctors, and gastroscopy should be reviewed regularly. Patients should have a light diet, preferably with digestive, warm food, few and many meals, and avoid adverse stimuli such as tobacco, alcohol, strong tea and coffee.