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The interannual variability and periodicity change of the Pacific-Japan (PJ) pattern during 1979–2008 are investigated using observation/reanalysis datasets and AMIP-runs of 20 atmospheric general circulation models (AGCM).The PJ pattern is represented by the first leading empirical orthogonal function mode (EOF1) of 850 hPa vorticity over the East Asian and western North Pacific regions in boreal summer.