Through a series of investigation and analysis, we get a general idea of the important risk factors of occurrence of gastric cancer. According to the statistical result of the data provided by the questionnaire, we found that the incidence in female was lower than that in male. Analysing the causes, probably it's because men like smoking and drinking more than women do, men also take more stress and there is psychological disparity between men and women. In Inherited respect, in 100 patients with gastric cancer, immediate family member with malignant tumors (24%), immediate family member with gastric cancer (12%), however, in control group, immediate family member with malignant tumors (6.4%), immediate family member with gastric cancer (3.7%), show that the people who have familial history of cancer is more likely to suffer gastric cancer. Smoking is closely associated with gastric cancer, this survey show that people who smoke more than 20 every day increase their risk of having gastric cancer by nearly 3 times. Drinking moderately administer to people's health, but excessive drinking can increase significantly risk of developing gastric cancer. As to the spirit, psychic trauma is related to gastric cancer.