15～25 day bandpass filtering was undertaken of 1983～1985 September-November 850 hPa zonal wind. Results suggest that 110 °E meridional wind LFO (low-frequency oscillation) wave exhibits north-(southward) propagation from the Southern (Northern) Hemisphere across the equator in a phasic manner and low-frequency cross-equatorial flow displays salient propagation east-and westward, showing periodic oscillation as cyclonic and anticyclonic circulation in the pentad mean wind. They are associated with the time-varying distribution of long spells of fine and overcast/rainy weather in autumn over the Changjiang basins in east and central China.