Abstract: In this paper,by employing the CCM1(R15L7)-LNWP spectral model,the influences of the Qinghai-Xizang Plateau on the seasonal transfer of the general circulation were studied.According to the initial of 17 March 1996,numerical experiments with and without orography are carried out respectively.The results show that the Qinghai-Xizang Plateau,as a heat source in middle of troposphere,produces a warm sector of 224K at 200hPa in May.The dynamic and diabatic heating effect caused by the plateau's huge orography decreases by 6K at 200hPa temperature in Antarctic.The biggest meions is -8.28K.This is favorable for the South Polar vortex to strengthen and widen from summer to winter.The orographic effect has a profound influence on the formation and maintenance of the northern hemispheric average trough and ridge.It makes the temperature gradient,near the plateau and 30°S,increase in the north and decrease in the sorth.It improves the northern shift of the mid-latitude westerly jet and subtropical high pressure belt,and plays an important role in the formation of meridional monsoon circulation in Asia.Moreover,the orographic effect strengthens the easterly wind belt over the Antarctic and polar cyclone near the Ross Sea,but weakens the South Polar low pressure belt at 500hPa.The appearance of cross-equatorial Somali jet relates to the effects of the Plateau,too.