In this study,based on the reanalysis data of NCEP/NCAR and NOAA SST data,the relationship between the anomaly of air-sea coupling in the Northern Hemisphere and the synergistic change of storm tracks in the interdecadal background of different PDO phases is analyzed.The results are summarized as follows:1) It is shown that a significant correlation is present between the interdecadal oscillation of the Pacific Ocean and the synergistic variations of the storm tracks over the Northern Hemisphere in winter.When PDO is in warm phase,it corresponds to the anomalous variation of the northern and southern positions of the two oceanic storm tracks.Additionally,the North Pacific storm tracks are southerly,and the central and eastern parts are weakened,while the North Atlantic storm tracks are enhanced in the north-central part of the north.The current variations of the two storm tracks are opposite when PDO is in cold phase.2) When PDO is in warm phase,it corresponds to the El Niño SST anomaly,and the North Atlantic SST is tri-polar;in addition,the mean trough ridge is strengthened,the meridional circulation is strengthened,the polar vortex is contracted,the North Pacific storm tracks are southward,while the Atlantic storm tracks are northward.At this time,the temperatures in the northern part of Eurasia and most parts of North America are rise abnormally,while those in southern Asia,northern Africa and the North Barents Sea drop abnormally,as do those in the southwestern part of North America and Greenland.The above situations are opposite when PDO is in cold phase.