Carbon dioxide laser is a gas laser with a wavelength of 10.6μm, which can be completely absorbed by human biological tissue (all skin is available). The output laser is an invisible light, using red semiconductor laser as the guide light. Its output laser is transmitted through an articulated arm, with better direction and higher energy density. When the laser beam passes through the focusing lens, the heat generated will vaporize the target tissue. The equipment uses a scanning dot matrix to emit laser, which can form a burning area composed of laser action dot matrix and intervals on the epidermis. Each laser action point can be composed of a single or several high-energy laser pulses. The laser action point can directly reach the dermis and form a conical hole. The laser stimulates the proliferation of tissue collagen and also promotes the reorganization of collagen. Moreover, due to the contraction repair of the conical hole, the skin will have a significant plump and tender effect, thereby significantly improving the phenomenon of skin sagging, quickly tightening the skin, and making the skin delicate, smooth and elastic. The newest types of laser resurfacing are Radio Frequency RF excited fractional laser. It was developed to remove skin more precisely, layer by layer, using very short pulsed light energy or continuous light beams that are delivered in a scanning pattern to remove thin layers of skin with minimal heat damage to the surrounding structures.