Abstract: The western Pacific subtropical high, an intraseasonal regime that features medium-term fluctuation in longitudinal location, was anomanously more to the south from July 29 to August 16, 1980, and anmanously more to the north from July 16 to August 12, 1983.In this paper, the two processes are investigated in comparison with each other in terms of their circulation characteristics and heating difference and further on, the relationships between the East Asian monsoon and (1) convection, and (2) the advancement / retreat of the subtropical high, is discussed.