本文初步探讨了我国各地区由于海拔、纬度、季节和环境等因素导致阳光辐射至地表的紫外线强度改变的规律及其对银屑病发病的影响。长期居住于高海拔地区的藏族,银屑病住院率明显低于居住于低海拔地区的其他民族。我国南方低纬度地区发病率高于北方高纬度地区。多数银屑病患者的病情夏季缓解,冬季加重,因夏季紫外线强度为冬季的1.92倍。农村大气层较城市洁净,紫外线强度高于城市,银屑病发病率显著低于城市。 This article initially explored the law of the ultraviolet intensity change of sunlight radiated to the surface due to altitude, latitude, season and environment in various regions of our country and its influence on the incidence of psoriasis. Long-term living in high-altitude Tibetan, psoriasis hospitalization rates were significantly lower than those living in lower altitudes of other ethnic groups. The incidence of low latitudes in southern China is higher than that in northern latitudes. The majority of patients with psoriasis in the summer to ease the disease, increased winter, due to summer UV intensity of 1.92 times in winter. The atmosphere in rural areas is cleaner than that in cities and the UV intensity is higher than that in cities. The incidence of psoriasis is significantly lower than that in cities.