Abstract: In this paper, we analyze the abnormal circulation of preceding stage on the drought and flood in summer over the Hetao Huabei region. and present an attempt to explore the forming mechanism of this abnormal circulation, and make the numerical experiment on effect of Atlantic heating with OSU-AGCM. The results show that the abnormal circulation of preceding stage in autumn and winter agree roughly with the drought and flood over the area in summer. The abnormal circulation is formed by the energy propagation to upstream-downstream of the stationary waves that is forced by the action of Atlantic SST anomaly.