Performed using IAP2 L AGCM model are experiments with the influence of Tibetan sensible heating reduciton anomaly on eastern hemisphere circulations and East Asian monsoon LFO in summer. Results suggest that when sensible heating is reduced below the mean in the plateau,variation in percentage variance of LFO increases in the South China Sea and Western Pacific and the abnormal heating has different effects on eastern Asian and Indian monsoons,with change in the phase of LFO over monsoon areas,its structure,strength and propagation speed at extratropics.Also,results show that the wavetrain becomes more evident and low frequency vortices propagate along the great circle route as far east as East China and low latitude Western Pacific,thereby exerting much impact on low frequency variation of summer weather in this part of China.