China is a high incidence area of gastric tumors, the mortality rate accounts for 23% of all malignant tumors, the first place of all kinds of tumor death. In addition to Helicobacter pylori (Hp), which has been identified by the World Health Organization as a definite tumorigenic source, nitrosamine is also a possible cause of gastric tumors. Therefore, the bad dietary factors of gastric tumor include eating cured and smoked fish and meat, high salt diet, moldy food, etc. In addition, emotional tension or sadness, introverted and depressed character may also lead to gastric tumor. It can be seen that the prevention of gastric tumors, but also from eating to start. First of all, we should correct the bad habits, avoid eating rough food, do not eat hot food, do not eat too fast, do not eat too salty food; eat less or not eat salt-preserved food, do not eat moldy food, eat less smoked, deep-fried and baked food; keep optimistic and cheerful mood, do not smoke. Advocating to eat more fresh vegetables such as garlic, onions, mushrooms, meat, fruits, etc., drinking more milk, often drinking tea, especially green tea, all of these help to prevent the occurrence of gastric tumors.