Liposuction is to cut a small hole in the surgical site, extend the liposuction tube into the fat layer, and then suck out the fat. There are many methods of liposuction, such as negative pressure, vibration, ultrasound and so on. General or local anesthesia was performed before liposuction, and the same amount of swelling liquid was injected. Director Zhang said that the swelling fluid is mainly composed of sodium bicarbonate, normal saline and anesthetic, which can reduce the amount of bleeding during operation and separate subcutaneous fat from some tissues for liposuction.