Abstract: Using the FGGE-IIIb data covering period from 14 June to 19 June 1979,the dynamic and thermodynamic influences of the Qinghai-Xizang Plateau on the drought weather in its northeastern side are physically investigated employing a general circulation model (T42L9) with a improved cloud-radiation scheme. By virtue of the five-day prediction experiments,with and without the inclusion of mountain and/or diabatic heating effects,it is found that the influences of Qinghai-Xizang Plateau are very significant for its northeastern drought-weather,and also for its eastern monsoon rainfall in the early Summer.