Abstract: Through analyzing the characteristics of Eurasian Continental seasonal thermal change,found that the heat difference was obvious meridional in winter and spring, while in summer and autumn it was the quasi-zonal.Further analysis also demonstrated that the meridional heat difference and the East Asian winter monsoon activity has a very good positive correlation,namely the thermal difference index is positive (nagetive),the East Asian winter monsoon is stronger (weaker).When the meridional thermal anomaly occurred simultaneously,the ocean thermal condition was significantly different,which led to the land-sea thermal contrast changed on the different regions,and then cause the different precipitation distribution over the East Asia.