Abstract: The solar ultraviolet radiation monitoring data of Xichang City and Panzhihua City from 2008 to 2011 were used to analyze the characteristics of solar ultraviolet index ( UVI ). Combined with the meteorological data such as cloud amount, sunshine and temperature, the multiple stepwise regression method was used to establish the empirical formula of UVI in Panzhihua City. The UVI of 22 districts and counties in Panxi area were calculated, and the spatial and temporal distribution characteristics were analyzed. The results showed that UVI of most counties in Panxi increased with the increase of altitude, and was significantly affected by local microclimate. The average annual UVI is 9~32, and the average annual days of UVI grade 4 to 5 are 253~358 days. The monthly average UVI was larger from February to May and smaller from November to January of the next year. The daily maximum UVI usually appeared at about 13 o'clock, but the UVI grade could reach 4~5 at 09~16 o'clock. UVI was slightly larger in cloudy weather than that in sunny weather, and significantly decreased in cloudy weather. It is suggested that comprehensive protective measures should be taken during outdoor activities during the daytime.