Using 1980～1983 ECMWF objective analyses investigation is made of the energy conversion between synoptic eddies and time mean flow for any month of a selected year,and a particular month of a normal and an EI Nino year. Evidence suggests that in the track region the synoptic eddy kinetic energy and effective potential energy are maximal so that energy conversion between such eddies and time mean flow are strongest;in the entrance and exit sectors of the track the conversion is reversed in direction such that the storm track is maintained in a more steady area.