ND: YAG Laser Cosmetic System introduces gem-adjusting Q switch, which uses high energy by instant emission of laser beam to crush and remove the pigment effectively in the pathologically changed tissues. That is an explosion led by laser beam: the laser beam at the fixed wavelength enabled by the accumulated high energy can reach the pathologically changed tissues through epidermis in a very short time (only 6 ns) to instantly crush the respective color base, then the corresponding pigment group gets swollen and outburst at last due to high energy, and part of the pigment group springs out of the human body (at shallow epidermis), and the rest (at basis tissues) pigment group will become very small particle before swallowed by the human cell which will be finally discharged out of the human body through lymphatic system circulation. The pigment of the pathological tissues will fade in color till it vanishes. And the surrounding normal tissues will not be ruined since they will not absorb the laser at that fixed wavelength.