After half of the stomach is removed, the patient’s survival time is closely related to the cause of the removal, i.e., the original disease, and may not affect life expectancy, or may have only a few years or even less of survival. Partial gastrectomy is widely used in the treatment of gastric and duodenal ulcers, benign tumors of the stomach, and gastric cancer, and has a good therapeutic effect. If the patient undergoes gastrectomy because of benign diseases such as gastric ulcer and duodenal ulcer, it usually does not have a great impact on natural life expectancy by paying attention to care and diet. If the patient has malignant diseases such as gastric cancer, the survival time can vary depending on the stage of the tumor. If the patient is detected and treated early, the five-year survival rate is higher; if it is advanced, the five-year survival rate is usually lower considering metastasis, physical condition, residual gastric cancer and other conditions. In addition, since the gastrointestinal function of patients with hemi-gastrectomy will be affected to a certain extent after surgery, it is important to maintain a positive and optimistic attitude, carry out a regulated diet, enhance personal fitness, review regularly and actively cooperate with treatment, which is conducive to prolonging life expectancy.