Ultraviolet ray can strengthen blood and lymphatic circulation, promote material metabolism process; Can make the ergosterol inthe skin into vitamin D, regulate calcium and phosphorus metabolism, promote the normal development of bone. Irradiation ultraviolet light will release histamine into the blood, stimulate the hematopoietic system, increase red, white blood cells, platelets, make phagocytes more active. Moderate and repeatedly irradiate ultraviolet ray can make the melanin in the skin increases, the skin after basking in presents a kind of uniform and healthy bronze color. And the color on the soleil is even and stable, can illuminate the whole body 360 degrees, on the one hand can improve the color uniformity of the skin, on the other hand can bring stable effect to ensure for the skin tone, but also can avoid the influence of weather on the tanning.