The life expectancy of gastric cancer patients cannot be generalized, it generally depends on the stage of the tumor and the degree of malignancy of the tumor, in addition to the patient’s response to the treatment and the treatment mode, etc. The prognosis of gastric cancer is mainly related to the clinical stage. The prognosis of gastric cancer is mainly related to the clinical stage. Early gastric cancer with small lesions and no lymph node and distant metastasis can reach more than 90% of 5-year postoperative survival rate if the patient’s condition is good, while the 5-year survival rate of mid-stage gastric cancer patients with active treatment is around 50%-70%, and if it is already in advanced stage gastric cancer, the 5-year survival rate is less than 10%. Tumor malignancy is generally divided into highly differentiated cancer, moderately differentiated cancer, low differentiated cancer and undifferentiated cancer. The higher the degree of differentiation, the lower the degree of malignancy. The treatment effect is better and the survival time is longer. Lowly differentiated cancers have a higher degree of malignancy, poorer treatment effect and shorter average survival time of patients. Early detection, early diagnosis and early treatment are the keys to improve the therapeutic effect of stomach cancer. It is recommended to have regular medical checkups, and if you have stomach cancer, you should follow the doctor’s prescription for treatment and keep a good mindset in order to improve the prognosis of stomach cancer.