The Los Alamos Sea Ice Model 5.0 (CICE5.0) was introduced to the Beijing Climate Center Climate System Model (BCC_CSM) as a new alternative to the Sea Ice Simulator (SIS).The new coupled model performance on the Arctic sea ice and polar climate simulations has been satisfactorily improved.On this basis,this paper evaluates the simulation performance of the new coupled model for East Asia winter climate from 1985 to 2014,and tests the impact of the improved Arctic sea ice simulation performance on the East Asian winter climate simulation performance.Results show that the new coupled model can well simulate the winter sea level pressure,850 hPa wind vector and radiation flux in East Asian,which can improve the simulation effect of climatological distributions of temperature and precipitation in East Asian.Further analysis indicates that,compared with the original coupled model,the new coupled model can better capture the response of East Asia winter sea level pressure,total precipitation and temperature anomalies to the sea ice concentration anomaly in Barents and Kara seas in the same period,thus improving the simulation ability of the model to temperature and precipitation variability in the mid-high latitudes of East Asia in winter.