Based on NCEP/NCAR daily reanalysis data and the northeast cold vortex(NECV) calendar from Meteorological Research Institute of Jilin province,this paper analyzes the influence of NECV on North Pacific storm track in winter of 1951/1952—2008/2009.Results show that:1)There is a significantly negative relationship between the change in days of NECV and the intensity of North Pacific storm track in winter,i.e.,the more(less) days of NECV appearance,the weaker(stronger) the storm track over North Pacific will be.2)The wavelet cross spectrum analysis shows that the above relationship is most prominent on the quasi-three-year period.3)In the winter of more NECV years,the low level temperature is falling from East Asia to North Pacific,and the major lower level cooling is located in the upper-stream of both subtropical jet and storm track,and between them latitudinally,which may induce a reverse effect on the jet and track,i.e.,a more southward,stronger and narrower jet because of the enhanced baroclinicity there,but a weaker storm track since the reduced baroclinicity and the lower level cooling in northwestern Pacific may weaken the wave seeding responsible for the eddy generation from East Asia to North Pacific;and vice versa.