The 1884~1994 dataset was used to investigate the space/time structures of the anomaly sea level pressure field in relation to mean temperature in northern winters on multi -time scales. The four basic modes whose spatial circulation structures and temporal evolution features, including secular trend, abrupt change and phasic behaviors, were documented, indicating that the mode of the second eigenvector (EOF2) of the pressure associated with the intensity of the Aleutian low bears a close relation to the mean temperature on interannual and interdecadal basis.