With the specially designed tri-pulse laser head, it only irradiates the skin with allow energy density, the first laser pulse through the epidermis heats the hair follicles. The second and third pulse selectively raised the temperature of hair follicles to approximately 45°C. The sliding 10Hz laser ensures that the hair follicles maintain the temperature for certain time, the hair follicles lose the growth activity, thereby achieving the purpose of long-term hair removal.