With the support of modern medical system and medical technology, both the safety and the results of the surgery are fully guaranteed, and its surgical procedures are constantly being explored, innovated as well as improved and eliminated, for example, single anastomosis gastric bypass surgery is a surgical procedure based on gastric bypass surgery with a simplified treatment. However, it is still in the exploration stage for the time being because there are not enough cases to support it. So far, the two commonly used procedures for weight loss and metabolic surgery in China are sleeve gastric and gastric bypass, which have been tested for a long time. Sleeve gastric surgery Sleeve gastric surgery is an operation characterized by the removal of most of the stomach to restrict the diet, which is suitable for all obese and mildly obese diabetic patients, and has the advantages of relative simplicity, few complications and no impact on absorption. Gastric bypass surgery Gastric bypass surgery is called the “gold standard” procedure for the treatment of obesity and diabetes, and its weight loss and hypoglycemic effect is generally better than that of sleeve gastric surgery, but it is also more difficult, not only is the operation more complicated, but the requirements for postoperative management are also higher. Both the sleeve gastric and gastric bypass procedures have been tested by time, but the specific choice of the procedure needs to be considered by a combination of factors.