It is shown in this paper that North China winter air temperature bears a significant relation with Arctic Oscillation(AO),especially on a time scale of decades,by applying the methods such as wavelet analysis,EOF and correlation analysis and by using the AO index,the NCEP/NCAR reanalysis data and monthly mean air temperature at 160 stations in China.The North China winter air temperature was successively cold before 1970s but warm after 1980s,and the years between them were relatively normal.The winter AO index showed similar three-stage variations.When the winter AO index was high/low,North China winter was warm/cold.The reason may be that the AO can excite anomalies like the EU teleconnection pattern from low to high level in the troposphere which affect the Siberian High and East Asian Trough, thus influencing North China air temperature.High/low AO index years are characterized by weak/strong East Asian Winter Monsoon,weak/strong Siberian High and East Asian Trough and by weakened/strengthened northeast surface wind over Asian continent.