Abstract: A mixed coordinates 5-layer primitive equations model is used to simulate the anomalous circulation stimulated by anomalous heating over ITCZ and the monsoon rain zone for East China, on which analyses are based of the effects of the 2 heating zones on the extension/retraction of the West Pacific Subtropical High. The experiments show that either single existence or combined action of the 2 heating zones can be favourable steering conditions for the westward extension of the High and their anomalous cooling makes it more likely for the High to retract out of East Asia continent.