Obesity often plague people’s lives, bring a lot of inconvenience to people’s lives. Obesity easily occurs in the waist, abdomen and hips, because the fat cells in these areas belong to the resting (inert) cells, which are easy to synthesize and not easy to decompose, so once fat accumulation occurs, it is difficult to restore normal body shape and people lose themselves. A perfect body is the dream of beauty lovers, and body contouring can help people with poor body shape to regain their confidence, and liposuction is the most fast and effective way to lose weight today. The procedure is performed through swelling technology and negative pressure suction to remove fat cells from obese areas and reduce the number of fat cells in terms of quantity, thus achieving weight loss. Liposuction is suitable for people with fat accumulation and poor shape in the waist, abdomen, buttocks, limbs and face. After more than 30 years of development, the technique of liposuction has been continuously improved. At present, the syringe method combined with swelling technology, shallow suction technology, upright position suction technology, and fat particle injection transplantation technology have made liposuction more and more perfect, and it has become the most common cosmetic surgery. At present, liposuction commonly includes ultrasonic liposuction, resonance liposuction, electronic liposuction and water beam separation liposuction, among which ultrasonic liposuction is common. Ultrasonic liposuction is to emulsify subcutaneous fat cells through the action of ultrasonic waves, and then suck out the emulsified fat through negative pressure, so as to achieve the purpose of weight loss. It has the characteristics of safety, no incision, no pain, no rebound, no scar left after surgery, etc. After surgery, the skin surface is smooth and elastic, the curve is more perfect, and the weight loss effect is immediate. Human skin is a biologically active organ, and different types of skin have a greater degree of retraction ability, even in the elderly. The contraction of the fibrous scar in the aspiration tunnel and the reduction of the subcutaneous fat volume after fat aspiration causes the skin to retract. With superficial fat aspiration technique, the skin fat flap left behind is thin, with light edema and little influence of gravity, and is fixed in normal position with elastic garment after surgery, and the skin can retract quickly by the contraction of the fiber scar; in addition, the stimulation of the dermis during surgery is also an important cause of skin retraction. Recurrence after liposuction can be divided into true recurrence and pseudo recurrence. True recurrence refers to the thickening of fat at the aspiration site after surgery, but it is generally thinner than the surrounding areas without aspiration, which is mostly seen in those who gain weight after surgery. False recurrence is due to the displacement of the surrounding hypertrophic tissue, resulting in the protrusion of the original aspirated site, while the site actually does not have fat recurrence growth. In order to achieve fast postoperative recovery and satisfactory weight loss effect, postoperative attention should be paid to: (a), choose suitable elastic clothing and wear it for 3-6 months after surgery to play a role in shaping and fixing. (b), change the diet and strengthen exercise to avoid excessive postoperative obesity.