As a I speak objectively, any surgery carries risks. However, with technological advances, instrumental innovations, conceptual alternations, and increased experience, the surgeon in charge will keep the risks to a minimum. Liposuction and grafting surgery can be described as: “difficult for those who do not know, will not be difficult”. The key to safety and the highest success rate for the patient is to “find a qualified medical institution and choose a qualified surgeon”. Historically, fat grafting was a technique with a high complication rate, and a few of these complications were serious and even fatal. However, with the continuous development and improvement of modern techniques and instrumentation, a whole system of fat surgery techniques has been developed, and the incidence of serious complications has been significantly reduced. Some basic principles that doctors and patients must follow together: 1. Preoperative comprehensive physical examination and medical history, a comprehensive assessment of the function of the important organs of the body, such as cardiovascular function, etc.. Preoperative investigation of potential diseases in the body, especially for the elderly over 50 years of age, special attention should be paid to the presence of hypertension, hyperlipidemia, hyperglycemia and so on. Abdominal weight loss need to pay special attention to its respiratory function, especially the estimation of the proportion of thoracic respiration, in order to prevent postoperative abdominal respiratory restriction, thoracic respiration can not be fully compensated for, thus causing insufficient ventilation, resulting in adult respiratory distress syndrome; abdominal, waist and hip obesity patients should pay attention to the possibility of coronary atherosclerotic heart disease and other potential diseases. 2, for moderate and severe obesity candidates, need to pay attention to identify whether it is morbid obesity, whether it is endocrine tumors and other diseases caused by obesity. For morbid obesity candidates, need to be especially explained, the first is to treat the primary disease. 3, smoking is contraindicated for plastic surgery. Therefore, patients with smoking habit need to avoid smoking for at least 1 week before surgery, and continue to avoid smoking for at least 2 weeks after surgery. 4, for patients who have been taking anticoagulants, vasodilators and hormonal drugs for a long time, 1~2 weeks before the operation should also be discontinued, such as aspirin, vitamin E, dipyridamole and so on. Mainly to prevent intraoperative and postoperative hemorrhage. 5, a one-time large amount of fat suction may appear fat embolism, water and electrolyte balance disorders and other diseases, and even life-threatening, should try to avoid the so-called “whole body ring suction” liposuction. After liposuction, it is recommended to get out of bed as soon as possible to avoid deep vein thrombosis caused by prolonged lying in bed. 7. Fat suction should not be too thin, otherwise it is easy to produce skin necrosis, or even need skin grafting. 8.Facial and chest fat grafting should not be overdone each time, try to adopt the principle of “small amount, many times”. Especially the facial fat filling can not be too much, otherwise it will lose the natural beauty, and difficult to deal with.