The working principle of LED for skin care is like Photosynthesis. Its nursing therapy is to use the power of light reaction on the skin maintenance and treatment of new technology. It converts light energy into cellular energy, accelerates cell growth and blood circulation, stimulating fibroblasts to produce collagen tissue and thus increasing skin elasticity. The “photosynthesis” LED has been shown to be effective in the treatment of several aspects of skin aging. Multiple studies have demonstrated improvement of fine wrinkles, mottled hyperpigmentation, red blood silk, and so on. These results are supported by both collagen production and increased proliferation.