Liposuction is a surgical procedure that uses physicochemical means such as negative pressure suction, ultrasound, resonance, high frequency electric field, laser, etc. to remove localized subcutaneous fat from the body through small skin incisions or puncture holes in order to improve the shape of the body. Therefore, liposuction is actually a good way to sculpt the body rather than a reasonable means to lose weight or weight loss, but even if the weight loss after liposuction is not significant, it is possible to return to the preoperative weight after a certain period of time, but the shape can be significantly improved. Indications for liposuction: Ⅰ Simple localized fat deposits without skin laxity, men with breast development, mostly patients under 30 years old, are the best indications for liposuction. Ⅱ Fat deposition with moderate skin laxity using fat aspiration alone. Ⅲ fat deposition with severe skin laxity; combined fat aspiration and dermatoplasty; Ⅳ skin laxity without fat deposition is suitable for skin soft tissue plastic surgery. Other relative indications are: patients with severe obesity, elderly patients, etc. Contraindications to fat aspiration: 1, heart and lung and other major organ function is reduced, can not tolerate surgery. 2.People with psychological disorders, high expectations and overly demanding requirements for their own body shape. 3.Severe skin laxity and too little subcutaneous fat tissue. 4.People who are morbidly obese. 5.People with local skin infection lesions and more scarring; heavy smokers and people with poor wound healing ability. 6, lower limb varicose veins, phlebitis, lower limb fat aspiration is contraindicated. 7, sacrococcygeal triangle and adhesion area. 8.Pregnant women or mothers with obesity syndrome. 9, Bulimia nervosa. 10, Patients before puberty (18 years old) are generally not suitable for fat aspiration, except for men with female-type breasts, severe obesity and other disorders that affect psychological development. Possible complications: 1. Common complications: unevenness, asymmetry, inadequate aspiration, erythema, etc. 2.Other complications Local complications: seroma, skin necrosis, loose and sagging skin, infection, peripheral tissue damage, postoperative pain and walking difficulties. Systemic complications: toxic side effects of drugs, fluid imbalance and circulatory overload, fat embolism and fat embolism syndrome, deep vein thrombosis and pulmonary embolism, necrotizing fasciitis, perforation of abdominal wall and viscera, toxic shock syndrome, vagal syncope.