Different responses of Northern winter atmospheric circulation to ENSO events are simulated under different surface sea temperature(SST) forcings using NCAR/CCM3 model.Comparison between simulated results and diagnostic results indicates that the model can simulate the response of Northern winter atmospheric circulation to ENSO events under different SST forcings.The simulated results are agree with the diagnostic results.Under SST forcing after the late 1970s,the strengthening action of El Niño events on Aleutian low is more obvious.Mongolian high is slightly weakened by El Niño events before the late 1970s,but it is markedly strengthened after the late 1970s.After the late 1970s,the strength of ENSO events becomes larger,but the abated effect of ENSO on East Asian trough and East Asian winter monsoon is not clear,and PNA pattern is obviously strengthened by El Niño events.