Based on the NECP/NCAR daily reanalysis data from 1948 to 2004 using the methods of filtering accumulative anomaly,Morlet wavelet transform and composite analysis,we studied the inter-decadal variation characteristics of the intensity,longitude,latitude and area index of North Pacific storm tracks,and found that the mean intensity of storm track centers during the 56-yr is about 32 dagpm² and it locates at about 44.5°N,172°W.Morlet wavelet analysis indicates that its strongest interdecadal periodical signal is 18-yr.Besides,the intensity of the centre and area index of storm tracks have a good mutual corresponding relationship.Generally,when the intensity becomes strong(weak),the area expands(shrinks) with a westward(eastward) and southward(northward) shift of the center.