Based on U.S.NCEP/NCAR reanalysis data and Northern polar vortex intensity data from China National Climate Center,with correlation analysis and composite analysis,the effect of Northern polar vortex intensity on North Pacific storm track and its possible physical mechanism are studied.Conclusions are drawn as follows:In the years when Northern polar vortex is stronger(weaker),North Pacific storm track is also stronger(weaker).The stronger(weaker) North Hemisphere polar vortex will enhance(decrease) storm track and disturbance kinetic energy in the storm track area.In the years when Northern polar vortex is stronger(weaker),the synoptic-scale disturbance meridional and vertical heat transports are stronger(weaker) than mean,and the synoptic-scale disturbance transport of westerly momentum is stronger(weaker) significantly.Further investigation shows that the anomalous changes of polar vortex give rise to change in the upper level geopotential heights over the Eurasian continent and its downstream Pacific ocean,then change the East Asia westerly jet and the baroclinicity in the upstream of the storm track,and finally the storm track.