There are many obese patients who seek help from the hospital to request a stomach cut, and some people who are not fat also ask for surgery, hoping to use weight loss surgery to slim down and shape up. To lose weight, rely on gastric resection, is this way reliable? There are strict indications for gastric resection surgery. The most important criterion for judgment is the body mass index, fat weight, abdominal circumference values, etc. also belong to the reference index.” Patients belonging to the following two conditions can be considered for surgery: BMI>35, with or without combined type 2 diabetes; BMI>28, combined with type 2 diabetes or metabolic syndrome such as fatty liver and hyperlipidemia, which are poorly controlled through lifestyle changes and medication.” Chinese people with a body mass index below 28 are not advocated to be treated by weight loss surgery, “weight loss can be achieved through a combination of diet control and exercise.” In addition, for patients who want to treat type 2 diabetes through surgery, this is not suitable for old sugar lovers whose diabetes has been in progress for more than 15 years, because the longer they have diabetes, the worse their islet function is, and surgical treatment is not effective. However, experts emphasize that for patients with severe obesity (BMI>40), weight loss surgery is the only means to obtain long-term and stable results. The Chinese Guidelines for the Surgical Treatment of Obesity (2007) stipulate that those who meet any one of the first three items below and have the fourth item can perform weight loss surgery 1, BMI ≥ 32kgm2 2, confirmed the emergence of obesity-related metabolic disorder syndrome, such as: hypertension, diabetes, fatty liver, sleep apnea syndrome, hyperlipidemia, etc., and the prediction of effective weight loss. 3, waist circumference: men ≥ 90cm, women ≥ 85cm; dyslipidemia. 4.Other: no alcohol or drug dependence, no serious mental and intellectual disorders; other weight loss methods are ineffective or intolerable; 16-65 years old; understanding and acceptance of surgery and post-operative lifestyle changes.