Japan, Chile, Iceland and other countries are high incidence areas of gastric cancer, with an annual mortality rate of 50~60/10U, while the United States and western European countries are low incidence areas, with an annual mortality rate of 20/10U or less, and the incidence of gastric cancer among Japanese descendants settled in the United States has decreased significantly due to their accustomed to the American lifestyle and diet. It can be seen that lifestyle and dietary habits have a great influence on the incidence of gastric cancer. According to statistics, the incidence of stomach cancer in Japan has been decreasing in recent years, which experts believe is related to the westernization of diet, the popularity of refrigerators and eating more fresh vegetables and dairy products. Although the cause of gastric cancer is not yet clear, according to epidemiological investigation, eating more fresh vegetables, fruits, dairy products, meat, less salted vegetables and pickled film food, and storing food in refrigerator seems to have a preventive effect. Daily oral intake of vitamin C also has a certain preventive effect. Regular diet, not eating cold and rotten food, not overeating, not drinking alcohol and avoiding too spicy food can play a role in preventing the occurrence of gastric cancer. Since there is no effective cure for gastric cancer, especially for middle and late stage gastric cancer, early detection and early treatment are very important to the prognosis of gastric cancer patients. Currently, Japanese scholars have put forward the argument that early gastric cancer can be cured at all. It can be seen that early detection, early diagnosis and early treatment are crucial for gastric cancer patients. Everyone in the society should raise awareness of cancer, improve self-care consciousness, go to the hospital for necessary medical checkups regularly or irregularly, pay enough attention to the uncomfortable symptoms in the gastrointestinal tract, give a comprehensive and detailed medical history when consulting a doctor, and actively cooperate with the doctor for corresponding examinations to avoid delaying diagnosis and treatment. It is worth reminding that patients who usually suffer from or have been diagnosed with atrophic gastritis, intestinal epithelial hyperplasia, gastric ulcer, gastric polyp, etc., which are considered to be pre-cancerous lesions, should pay more attention to the changes of their conditions and go to the hospital regularly for examination. For those who are highly suspected of having gastric cancer and cannot be clearly diagnosed by pathological examination, they should weigh the pros and cons and seriously consider whether to undergo a caesarean section and the corresponding surgical treatment. Raising the awareness and vigilance of our citizens about this disease, vigorously publicizing and popularizing medical health and knowledge about gastric cancer prevention and treatment, and conducting screening of high-risk groups is also an important aspect of prevention and treatment.