Abstract: Based on the 1982-1983 and 1984-1985 winter grid data of the ECMWF, low-frequency interactions between the westerly jet of East Asia and Australian summer monsoon and their possible propagation modes are investigated in this paper. The results show that there is a good consistency between the low-frequency variations of the westerly jet (and its relevant front zone) over the Northern China and Australian summer monsoon. The expression of their links, and interactions are shown by the fact that East Asian westerly jet affects the low-frequency variations of Australian summer monsoon through changing the cross-equatorial flows over the Northern West Pacific; Australian summer monsoon influences East Asian westerly jet by strengthening and weakening the upper-level northward divergent flows. We call those interactions as the "low-frequency coupling processes" of Asian and Australian monsoon circulations.