The sequelae of liposuction have been improved several times, and its equipment and technology are constantly being updated and improved. From the initial liposuction and scraping technology, it has developed into dry and wet liposuction, electronic liposuction, ultrasonic liposuction and electrotomy plus negative pressure liposuction. Its progress is rapid, but it is still easy to produce some complications, so preventive measures need to be taken: First, the operator should be familiar with the vascular and neuroanatomy of liposuction site, and strictly and correctly operate liposuction procedures to minimize the occurrence of surgical complications. Secondly, ecchymosis of skin is mostly caused by superficial fat layers and bleeding, and improper suction operation, such as side suction, will damage larger nerves and blood vessels, so it is necessary to operate correctly. If there is a dark fat mixture containing blood samples during aspiration, the aspiration direction of the aspiration tube should be appropriately changed or the aspiration should be suspended. At the same time, local appropriate pressure for a period of time, usually 3-5 minutes, operated by an assistant. Third, skin necrosis and blood circulation disorder are related to skin trauma and shallow inhalation. Generally, the suction depth is about 2 cm under the skin. Fourthly, the infection of wound and liposuction area is mainly related to lax disinfection, hematoma formation in operation area and untimely treatment. In addition to paying attention to liposuction methods, we should also use strong antibiotics in time, and carry out blood transfusion and infusion treatment when the extracted fluid reaches 2000-2500 ml. Fifth, skin wrinkles are related to unevenness, uneven liposuction, inconsistent amount and loose skin. Once it is very difficult to handle, it is better to pay attention to the operating procedures and methods. Sixth, the problem of fatty lung or cerebral embolism is a very serious and fatal complication. Besides being careful not to damage large blood vessels during the operation, the unabsorbed fat and liquefied fat should be squeezed out carefully after the operation, and the effective and appropriate pressure should be used for pressing and dressing after the operation, which can not only relieve pain and stop bleeding, but also help to shape the skin, make the skin smoother, and reduce the chance of residual free fat particles entering blood vessels, thus reducing the occurrence of serious complications of fat embolism.