The basic principle of ultrasonic beauty instrument is to use ultrasonic waves, deep into the subcutaneous 4-6mm, due to the strong penetrating power of ultrasonic waves, can break up the molecules of larger maintenance components into fine molecules, and give full play to its penetrating power to achieve the purpose of skin care. Ultrasound has the characteristics of wide treatment range, high frequency, good direction, strong penetrating force, high tension, good efficacy and fast results. Most of the beauty instrument with energy, there will be a certain number of risk factors, but in most cases, are caused by improper operation of the side effects, the side effects mainly include the following: 1, due to improper operation, the probe is too hot easy to burn the skin, the concentration of too small aqueous drug, not suitable for direct penetration, can cause dry skin; 2, ultrasonic beauty instrument can stimulate the mother cells of the basal layer of the skin, when the mother cells are stimulated will multiply rapidly, so the phenomenon of skin improvement will occur for a short time. But because the phenomenon is contrary to the skin’s own metabolic cycle, the cells caused a lot of damage, a large number of cells due to the lack of sufficient nutrition and death, the skin will also become very thin, resistance to decline. If the long-term and short-term frequent use of beauty device, but also can cause some harm to the body.