The theory of selective photothermy and decomposition is an extent of traditional photothermy. Integrating merits of both invasive and non-invasive treatment, CO2 fractional laser device has fast and clear curative effects, minor side effects and short recovery time. The treatment with CO2 laser refers to acting on skin with micro-holes; three areas including thermal desquamation, thermal coagulation and thermal effects are formed. A series of biochemical reactions will occur to skin and stimulate skin in self-healing. Skin firming, tendering and colored spot removal effect can be achieved. Since the fractional laser treatment only covers part of skin tissues and new macro-holes will not be overlapped. Thus, part of normal skin will be reserved, which quickens recover.