Laparoscopic surgery for weight loss is aimed at patients with simple obesity. The so-called simple obesity refers to the disease of imbalance of energy metabolism caused by certain life behavior factors, and it is necessary to exclude congenital, metabolic, and secondary obesity caused by neurological and endocrine diseases. Mild obesity does not require surgery, and can be treated by diet control, exercise, drugs and other methods. Indications for bariatric surgery in the United States: 1, BMI body mass index: weight (kg) / (height m) 2 > 40 or > 35 combined with obesity caused by the main medical disease. 2, Failure of internal medical treatment. 3.Age 18-55 years old. 4.No major organ function is seriously impaired and can accept surgery. 5.Exclude secondary obesity. According to the characteristics of obese patients in China, the indications for surgery are BMI>30 combined with medical diseases caused by obesity. With the improvement of people’s living standard and the change of diet structure, the incidence of obesity disease also has the trend of increasing year by year, regardless of domestic and foreign, obesity disease has become one of the most widespread and serious threat to human health diseases at present. People must correct a concept that laparoscopic bariatric surgery is not equivalent to cosmetic surgery, not only to maintain a good figure, but mainly to treat obesity disease, which can lead to diabetes, cardiovascular disease, gout, apnea syndrome, gallstones, arthritis, lower limb bruising and so on. It seriously affects the life expectancy and quality of life of patients.