The solar radiation in longwave region is usually neglected in climate models.The matrix formulations for the radiative transfer are applied into the general circulation model (BCC_AGCM2.0.1) developed by National Climate Center to test the effect on simulated radiation flux and temperature after adding the calculation of solar radiation in longwave region.Results show that,relative to the ISCCP and CERES radiation data,the simulated downward radiation flux in longwave region in surface in clear sky is reduced 2.05 W/m² by mean error and 1.29 W/m² by root-mean-square error.The upward radiation flux in longwave region at the top of climate model in clear sky is reduced 0.70 W/m² by mean error and 0.21 W/m² by root-mean-square error.The downward radiation flux in longwave region in surface in whole sky is reduced 1.38 W/m² by mean error and 1.03 W/m² by root-mean-square error.The upward radiation flux in longwave region at the top of climate model in whole sky is reduced 0.99 W/m² by mean error and 0.30 W/m² by root-mean-square error.Relative to ECMWF reanalysis data,the method including solar radiation in longwave region can improve the cold bias simulations of temperature in the region between upper troposphere and lower stratosphere over the equatorial region.The tropopause temperature is reduced 0.27 K by mean error and 0.25 K by root-mean-square error.