Regional Climate Model version 4.1 (RegCM4.1) is coupled with subgrid-scale orographic radiation parameterization scheme (SORP) and the effect of which on the performance of RegCM4.1 in simulating the climate of East Asia in summer has been systematically investigated in this study. Results have shown that RegCM4.1 overestimates the heat source of the Tibetan Plateau, the southwest monsoon and the precipitation over China in summer. Compared with those simulated by RegCM4.1 without SORP, the surface long-wave and solar radiation fluxes simulated by RegCM4.1 with SORP decline more than 12% and 5% over the Tibetan Plateau, the decreased surface long-wave and solar radiation fluxes simulated by RegCM4.1 with SORP lead to the weakened heat source of the Tibetan Plateau and southwest monsoon and thereafter the improvement of the precipitation simulation in summer. The improvement of the precipitation simulation in summer declines from southeastern China to northwestern China. Over the southeastern China, the spacial correlation coefficient and Taylor skill score of the simulated summer precipitation increase 0.14 and 0.08, the relative root mean square error decreases about 9%.