Abstract: Investigation is conducted of the interannual variability of northern Pacific storm track and its association with 500 hPa height and tropical and northern Pacific sea surface temperature(SST)during winter.Evidence suggests that during the studying period the northern winter Pacific storm track center experiences substantial interannual variability in variation of its latitude,longitude and intensity.Singular value decomposition(SVD)of 15 winter 500 hPa filtered potential height variance over the storm track with tropical and northern Pacific SST shows that the first coupled mode depicts the effect on the track of SSTA over equatorial central and eastern Pacific,while the second one reflects the impact of Kuroshio SSTA on the track.Further composite analysis indicates,moreover,that the SSTA over Kuroshio (equatorial central and eastern Pacific) during winter,which is relative to WP (PNA) teleconnection response pattern in 500 hPa height field respectively,exerts crucial influence on the interannual variability in vigor and meridianal(zonal) displacement of the central and western(eastern)part of Pacific storm track.