The NCEP/NCAR reanalyzed surface atmospheric data (SAT) are used to analyze the temperature variations in the North of East Asia (NEA) in winter from 1949 to 1999.The results demonstrate that SAT of NEA has increased since the 1970's, and has very clear interdecadal variation feature.This kind of anomalous atmospheric temperature variability is mainly influenced by the winter monsoon.During the recent two decades, AO always stays at high phase and increases continuously, at the same time the winter monsoon is decreasing.Our research shows that AO possibly causes the anomaly of atmospheric circulation and the SAT increasing of NEA.