The therapeutic principle of photon rejuvenation is that specific intense pulsed light energy passes through the skin, and intense pulsed light with different wavelengths produces selective effects on tissues, resulting in different characteristics of photobiochemical and photopyrolysis reactions. Short-wavelength light selectively acts on small blood vessels, pigment clusters or pigment cells under the skin, making the temperature higher than that of normal skin tissue, sealing the blood vessels through the temperature difference between them, and breaking and decomposing the pigment clusters and pigment cells, thus achieving the effect of removing red blood and pigment spots. Long-wave light stimulates collagen fibers and elastic fibers, causing chemical changes in molecular structure and rearrangement of collagen fibers and elastic fibers in dermis, thickening collagen tissue and enhancing skin elasticity, which has the functions of improving skin texture and restoring whiteness, exquisiteness and elasticity.