Abstract: Using mean zonal winds objectively analysed by NMC for 850 hPa (Dec. 1974-Feb. 1988) and 200 hPa (Mar. 1968-Feb. 1988), quasi-biennial and quasi-3-to-4-year oscillation are invenstigated. It is found that the two oscillations are propagating from west to east at all levels, being out of paase for the tropics but in phase for the mid-latitudes; for the latter oscillations in West Pacific, it travels equatorially from both mid-latitudes at low-levels while from south to north through a well-defined channel at 175-140°W at upper levels with wavenumber 1 in meridionality.