Surgical weight reduction refers to the use of medical-surgical means to improve the obesity of patients with systemic symptoms such as: overweight, hypertension, high blood pressure, high blood lipids, diabetes and other symptoms of medical treatment, the two most popular weight reduction surgery are sleeve gastrectomy and gastric bypass surgery. 1.Sleeve Gastrectomy Laparoscopic gastric reduction surgery is also known as Laparoscopic Sleeve Gastrectomy. Because the surgery will cut off 80% of the stomach volume, in addition to reducing the amount of food, it will also reduce the amount of Ghrelin, a hormone that stimulates the appetite, so the appetite will also be reduced. Within two years after surgery, approximately 10-15 BMI or 70% of excess body weight can be lost. For those who have a high BMI (over 40) and have difficulty reducing their appetite, gastric reduction surgery can achieve the desired weight loss. Method: 2-6 cm of the sinus above the pylorus is preserved in the direction of the greater curvature of the stomach, and the greater part of the stomach is removed along the long axis of the stomach, with the entire fundus removed, leaving a “banana-shaped” stomach with a volume of about 60-80 ml. Principle: To reduce the volume of the stomach and decrease the secretion of hormones that stimulate the production of hunger. Advantages: It does not change the physiological state of the gastrointestinal tract and does not interfere with the normal process of digestion and absorption of food. Evaluation: Sleeve gastrectomy has good therapeutic effect on type 2 diabetes and is widely used in Europe and America for weight reduction. 2, gastric bypass surgery gastric bypass surgery refers to a series of similar, for the treatment of obesity surgery, its common features are: surgery first will be divided into two parts of the upper and lower stomach, smaller upper, and larger lower, and then truncate the small intestine, rearrange the position of the small intestine, change the food through the digestive tract, slow down the gastric emptying speed, shorten the small intestine, reduce absorption according to the U.S. National Health Center 2008 According to data from the National Center for Health in 2008, gastric bypass surgery has replaced gastric reduction surgery as the most popular bariatric surgery in the United States after 2000, with about 100,000 cases performed each year. Method: On the one hand, food intake is restricted by building a small gastric bursa in the upper part of the stomach, and on the other hand, food is bypassed through the large part of the stomach, duodenum and the first section of the jejunum by anastomosis of the small gastric bursa on the distal empty occasion, thus greatly controlling food intake and absorption. Principle: Changing the intestinal structure, shutting down most of the gastric functions, reducing the space of the stomach and the length of the small intestine. Advantages: Significant weight reduction and treatment effects can be expected to be maintained over time. Evaluation: Among weight reduction and diabetic surgery, gastric bypass has been studied earlier and more frequently, and it is the most effective treatment for patients with type 2 diabetes with obesity.