The paper analyzed the characteristics of the monthly and the daily variation of solar ultraviolet radiation and the effect of meteorological factors to solar ultraviolet radiation using the surface solar ultraviolet radiation data from March to November in 2003 at Baiyin.Results show that in one year the solar ultraviolet radiation is highest in summer，higher in spring，lower in autumn，lowest in winter.in one day the solar ultraviolet radiation is high in noontime，low in the morning and in the afternoon.The meteorologic factors such as cloud，temperature，humidity etc are very correlative with the solar ultraviolet radiation.