This study explored interdecadal variation of heavy snow in northern China and its relationship with atmospheric circulation and Arctic sea ice by using statistical methods such as correlation and regression.Results show that the high frequencies of heavy snow in northern China in winter are mainly located in Northeast China (NEC),and its spatial distribution shows an increasing trend from northwest to southeast,together with obvious interdecadal variations.Heavy snowfall in NEC is less during 1965-1980,but more during 2002-2011.Analysis shows that there is less water vapor transported to NEC during 1965-1980,but more water vapor transported from Northwest Pacific to NEC during 2002-2011.Meanwhile,the cold polar air guided by northerly airflow and Pacific warm moisture transport guided by southerly airflow benefit a convergence frontogenesis in NEC,providing favorable dynamic conditions for the frequent occurrence of heavy snow,and leading to the interdecadal increase of heavy snow in NEC.Furthermore,it is found that there is a close linkage between the interdecadal decrease of Arctic sea ice in early autumn and the interdecadal increase of snowstorm in NEC.Anomalous circulation pattern caused by the decreased Arctic sea ice in autumn shows that the zonal westerly decreases and NAO is in the negative phase,which can intensify atmospheric meridional activity and be conducive to the southward invasion of polar cold air,leading to the convergences of cold air and warm moist air in NEC.This is a possible important reason for the interdecadal increase of heavy snow in NEC.