In the context of the ECMWF daily analysis and NCAR reanalysed data investigation is undertaken of the ENSO effect on the Pacific storm track during winter. It is shown that mean baroclinicity shows a great increase (decrease) over the Pacific storm track area during El Nino (La Nina) year, which makes the track strengthen (weaken) along with stretching eastwards (withdrawing westwards) and vigor (faint) low-level up-and pole-ward transport of transient edd heat fluxes there, suggesting that the ENSO event plays a crucial role in the maintenance and development of the Pacific storm track.