Used was an one-way nested grid model consisting of a five-layer primitive equation model containing topography (Qian) and a limited-area fine mesh model over complex terrian to investigate the effect on east-Asian summer climate of the vegetation over the Tibetan plateau and its surroundings. The nested model was carried out in such a way that height and temperature fields at a range of characteristic surfaces from 5 day integration from the former submodel as initial fields were offered to the latter as boundary values at a 24 h interval. Also, the air-earth model was based on coupling by a surface heat balance equation revised by the vegetation parameterization (Deardorff). On this basis, numerical experiments were conducted for the cases of vegetation available (Exp. I) and none of it (Exp. II) in summer. Evidence suggests that coherence coefficients between the simulated and observed height and temperature fields were higher in Exp. I, and some increase was found in sea surface level pressure, low-level (850 hPa) height, latent heat transfer, humidity throughout the atmospheric extent and precipitation from Exp. I compared to the case of Exp. II in contrast to the temperature and thermal low intensity in the former case.