A new regional climate model RegCM3 has been used to simulate summer precipitation in May-August 1998 over Eastern China,and its capability of simulation for precipitation and large-scale circulation systems is investigated.The result shows that different convective schemes made large differences in the simulation of rainfall for different months and regions,the schemes of Kuo and Grell exhibited better performance than the scheme of BM;the RegCM3 could well reproduce the main features of monthly variation and spatial distribution of rainfall;it also well simulated the evolution of subtropical anticyclone ridge in the Western Pacific and two northword-propagating intraseasonal oscillations.Therefore we consider that the model can be applied to the study of summer precipitation simulation over Eastern China.