In atrophic gastritis with intestinal metaplasia, the time of carcinogenesis is related to the type of intestinal metaplasia, and its carcinogenesis process is slow, at least several years or even decades, which varies from person to person. Chronic atrophic gastritis is often characterized by atrophy of the epithelium and glands of the gastric mucosa, a decrease in the number of glands, and thinning of the gastric mucosa. According to the degree of glandular atrophy can be divided into mild, moderate, and severe, and can be divided into atrophy with intestinal chemosis and atrophy without intestinal chemosis. The typing of intestinal metaplasia is generally divided into four subtypes: complete small bowel metaplasia, incomplete small bowel metaplasia, complete large bowel metaplasia and incomplete large bowel metaplasia. The wider the distribution of intestinal chemosis, the higher the risk of developing gastric cancer. Usually 8% of patients with intestinal chemosis can evolve into heterogeneous hyperplasia, which will evolve into gastric cancer and usually takes a longer time. During the period of illness, attention should be paid to controlling diet, avoiding overeating, not eating spicy and stimulating food, and focusing on light diet.