The scientific name for ultrasonic scalpel is micro-focused ultrasound, which is focused ultrasound that acts on the deeper layers of the skin and subcutaneous tissues to produce a tightening and lifting effect. Micro-focused ultrasound technology, the effect of different equipment varies greatly. Such as the United States as the representative of the focused ultrasound technology, the intensity is relatively strong, the effect of the depth of the deeper, at the same time, the treatment process may have a contraindication to the treatment, because the energy is relatively strong, some areas can not be done, it may be easy to damage the nerves and blood vessels. Good results can be achieved at one time, and the maintenance time is relatively long. South Korea or China’s focused ultrasound equipment, due to the focusing intensity is relatively small, the depth is relatively shallow, in the operation is actually a full range of indistinguishable operation, the comfort of the treatment process is relatively high, the same time the effect of a treatment to maintain a relatively short period of time. Need multiple treatments to complete, such as 3-5 times as a course of treatment. Therefore, ultrasonic knife for facial rejuvenation treatment needs to be done several times depending on the person. However, it should be reminded that so far in mainland China, focused ultrasound for facial rejuvenation has not been officially authorized.