By using a five-layer primitive equation model in the p-σ incorperated coodinates,astudy is made of the relationship between the East Asian winter monsoon and the forcedwaves excited by the convective heat source associated with the low-frequency change ofAustralian summer monsoon. Experimental results indicate that the low frequency changecan cause the LFO of the Northern subtropical upper and low level circtilation,east-westWalker circulation,meridional circulation and cross-equatorial flow,Its oscillation period andintensity are related to those of the heat sotirce. Besides,the low frequency heat source canexcite the northward disttirbance,resulting in the LFO of the stibtropical cicrulation and sub-tropical west wind jet in the Northern Hemisphere. Six days or so after the onset of Australian summer monsoon East Asian winter monsoon can have a strengthening process。However,the lull of the Australian monsoon has no impact on the East Asian winter monsoon.