The variation characteristics of surface total ultraviolet radiation (UV) over desert and arid region in Minqin was analyzed by using the land-surface radiation datum observed at Minqin during the intensive observational experiment in spring of 2010. The results show that: The ultraviolet radiation and global radiation exhibit consistent variation features, and the opaque cloud have much stronger reflected intensity of global and ultraviolet radiations than thin cloud. For the whole period of measurement, the instantaneous maximum of UV is 55.92 W·m-2, and the overall daily average is 1.07 MJ·m-2. The mean ratio of UV to global irradiance is 4.7%, ranging from 3% to 9%. Based on the relationship of clearness index (Kt) and maximum UV (UV0) and global radiation (G) measurements, we develop two empirical formulae are UV=2.94+1.22 (Kt×UV0) and UV=0.047G, respectively, which can be estimated surface ultraviolet radiation under all-weather condition. Due to influence by the accuracy of input parameters for model, SBDART radiative transfer model generally underestimates the UV radiation under clear-sky condition, which can be about 1.12 W·m-2 (～5.6%), varying within -2.8 to 0.2 W·m-2.
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