The main frequency of high-frequency electrotome is about 500KHz, such as GD350-B, B4A and B5 in Shanghai Hutong, and the power is about 350W. The main engine of RF knife works at a frequency above 4MHz, and its power is about 350W. The higher the working frequency, the better the skin effect of current. When high-frequency current acts on the surface tissue, the damage to the deep tissue of human body is less, such as GD350-E machine in Shanghai Hutong.