Global, diffuse and direct radiation were simulated by WRF-SES2 radiation model system in Beijing urban area based on ECMWF and NCEP reanalysis data in January, April, July, and October 2010. The differences of solar radiation was put emphasis on simulation using the two kinds of reanalysis data and impacts of differences of total cloud amount on radiation simulation. The results showed that：(1) Simulated values of global radiation in most of times are larger than the observed values and those of scattered radiation are smaller; simulation values of total cloud amount are less than the observed values; errors distribution scopes of direct radiation are larger than global and scattered radiation. (2) In general, simulated errors of global, direct, diffuse radiation based on EC data in most of periods are less than those based on NCEP data because simulation errors of microphysical quantities of cloud using EC data are less than those with NCEP data. (3) Simulation effects of global radiation in January and April are better, those in October take second place, those in July are worse. Namely average absolute errors in January and April are smaller and distribution scopes of simulation error are narrower, falling in between -50 W·m-2 and 200 W·m-2. Simulation effects of direct radiation are better in January, followed by those in April and October and results in July are worse. Those of scattered radiation are better in January and October, followed by those in April and July. (4) Simulation accuracy of global, direct and diffuse radiation were obviously affected by simulation effects of cloud amounts in initial fields. When sky is cloudy and rain falls, simulated errors of solar shortwave radiation based on EC data and NCEP data are large and data assimilation in the initial field and corrections are required. We will improve simulation of solar shortwave radiation in the future research using data assimilation method, more accurate the atmospheric radiative transfer model, advanced cloud parameterization schemes and effective correction methods.
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