Abstract: In this paper, the seasonal variation of cross equatorial flow over the east hemisphere is analyzed by using six level monthly mean wind data from Jaunary 1979 to December 1987.The results are as follows: the maximum of the absolute magnitude of the cross equatorial flow does exist at lower level of troposphere in winter and summer but at higher level of troposphere in spring and fall. The cross equatorial flow propagates southward in winter and fall but northward in summer and spring. The time when the propagating direction of the meridional wind component at equator changes is March and November at lower level but June and January at higher level.