Abstract:A model for predicting the global ultraviolet radiation arriving at the ground surface is developed in this paper on the basis of the parameterization scheme by Chen Wan long,the height amending equation of Frederick model and NWS'cloudness amending equation,and predictions of ultraviolet radiation intensity are performed.Results show that under a clear sky the model can satisfactorily reflect the variational trend of ultraviolet radiation fairily well,and under a complicated sky circumstance such as a part cloudy,cloudy,or over cast sky,the forecast errors are relatively larger,however it can basically reflect the variational trend and law of ultraviolet radiation intensity.The model allows for various influencing factors,and may be applied to the prediction of ultraviolet radition intensity in cities.