Super obese people with BMI over 40 must undergo certain preoperative interventions before weight loss surgery. Heart function and so on control in the safe area, in order to ensure the smooth operation and surgical results. 1.Dietary intervention In the dietary intervention, firstly, patients review their personal diet and exercise, make individualized recipes according to their different dietary habits, take into account their personal preferences, and guarantee the compliance of dietary interventions, such as restricting high-fat foods or foods rich in carbohydrates, with the aim of effectively controlling caloric intake and finally achieving negative energy balance. 2.Behavioral intervention Daily regular measurement of the patient’s test weight, leg circumference, urine volume, abdominal circumference, access statistics, always monitor the patient’s physical indicators. 3.Psychological intervention Many super obese people will have different degrees of psychological problems, so before the surgery, the health manager and the psychological counselor will carry out some psychological guidance to the patient and adjust the patient’s mentality. 4.Physical therapy intervention Because the body of super obese people is overloaded for a long time, the cardiopulmonary function will be slightly weaker compared with normal people. If there is severe snoring, daily oxygen intake and wearing a ventilator to sleep at night are also required. In addition, preoperative multidisciplinary consultation is also an important means to ensure the smooth operation. Experts from multiple disciplines will conduct a comprehensive review and consultation on the physical condition of the super obese patient and discuss the most suitable operation plan for the patient. At present, many mature bariatric centers in China have already formed a complete preoperative intervention system, which will help greatly improve the long-term efficacy of metabolic surgery and benefit super obese patients to the greatest extent.