Using the regional climate model (RegCM4.1.1-CLM3.5), East Asian summer monsoon and precipitation over China during 2000 to 2009 were simulated. After the examined with reanalysis data and observation records, the model was used to study the effect of vegetation over the Qinghai-Xizang Plateau(QXP) on summertime precipitation in the eastern China. The result shows that the model can well reveal the averaged summer characteristics of 500 hPa geopotential height and the time evolution of western Pacific subtropical high, and it can also partly reproduce the summertime precipitation over Eastern China. However, the simulated western Pacific subtropical high seems weaker on the sea and there is also a certain deviation for the surface air temperature and precipitation. When the vegetation over the QXP changes worse, latent heating effect in the middle of troposphere above the QXP decreased obviously. Because of the zonal temperature advection, minus deviations of temperature and geopotential height are found in the upper troposphere, leading to a westward extending of south Asia high and a weakening of western Pacific subtropical high. As a result, due to the abnormal distribution of water vapor transmission of lower troposphere, precipitation in southern and northeastern China increases while that in northern China decreases.
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