The principle of gastrectomy is to use a laparoscope to cut out the large curve of the stomach vertically, creating a small stomach sac of about 150cc, which can hold about 4-5 ounces of food. It has the advantage of not requiring the placement of foreign objects in the body and the surgery is remarkably effective for weight loss. Because the surgery will cut off 80% of the stomach volume, in addition to reducing the amount of food eaten, it will also reduce the production of the hormone Ghrelin, which stimulates appetite, and therefore appetite will also be reduced. Within two years after the surgery, about 10-15 BMI or 70% of the excess weight can be lost. For those who have a high BMI and have difficulty in reducing their appetite, gastrectomy can achieve the desired weight loss results. Gastrectomy is one of the most useful methods to treat obesity internationally, and after improvement and upgrading, it has become one of the most suitable minimally invasive surgery for weight reduction in the East, with good weight reduction, high safety, fast post-operative recovery, and can also improve or deal with complications caused by obesity while treating obesity. Clinical research results show that gastric bariatric surgery has obvious weight loss effects, the whole process of visualization, minimal surgical trauma (0.5-1cm), and you can get out of bed the day after surgery and be discharged from the hospital in 3-5 days. According to the post-operative follow-up data, after gastric resection surgery, one can lose 50-60 pounds in 3 months and 70%-80% of the excess weight in a year. Gastric resection surgery is suitable for people: 1, the course of type 2 diabetes ≤ 15 years, and the pancreatic islets still have some insulin secretion function, fasting serum C peptide level ≥ 2/1 of the lower limit of normal value; 2, BMI ≥ 27.5kg/m2; male waist circumference ≥ 90cm, female waist circumference ≥ 85cm, the recommended level of surgery can be increased as appropriate; 3, the recommended age of 16-65 years; 4, BMI in Patients with BMI between 25.0-27.4 kg/m2 need to consider surgery with caution.