Stomach cancer is a kind of malignant tumor that seriously threatens human health. In the past, in our country, stomach cancer was the malignant tumor with the highest annual mortality rate, known as the "No.1 Cancer". In recent years, with the rapid increase of the annual death rate of lung cancer, currently in the urban areas of our country, the annual death rate of lung cancer has jumped to the first place, and stomach cancer has retreated to second place. However, even though it has changed from "cancer No.1" to "cancer No.2", the "killer nature" of stomach cancer has not decreased but increased. According to statistics, more than 300,000 people die of stomach cancer every year in our country.