Laser lipolysis mostly uses 1-500mW or 5-500mW low-energy laser. Laser lipolysis can be divided into in vitro laser lipolysis and in vivo laser lipolysis. In vitro laser lipolysis does not need to make an incision in the skin, while in vivo laser lipolysis needs to make a small incision in the skin, insert a laser fiber catheter, and then irradiate the laser. The front end of the optical fiber conduit is the release part of the laser. According to expert Hu Qingxu, laser can produce heat, light, chemical effects and biological stimulation to tissues. When laser dissolves fat, the laser therapeutic instrument releases laser energy, and selectively melts the cell membrane of fat cells through the thermal effect of laser, so that fat is ruptured and liquefied, and the number of fat cells is reduced. The small area of melted fat can be discharged by extrusion or syringe suction, while a large amount of liquefied fat needs to be sucked out by a special laser probe under negative pressure. In addition, the energy released in the process of laser lipolysis can stimulate the proliferation of collagen in the skin, making the skin firm and curved after eliminating fat. The commonly used lasers for liposuction in clinic are HeNe (He-Ne laser) and Nd:YAG laser with the wavelength of 65438±0064nm.