Abstract: Through comparing the variation characteristics of thermodynamic field,SST and convective activities in Eurasian meridional heat anomaly years winter and the late period,conclusions have been drawn as follows: The Eurasian thermal difference exists from winter to spring, and disappeares in April. Meanwhile,the meridional circulation will emerge anomaly in late early-summer and summer,resulting from the difference in tropical SST and East Asia spatial distribution of heat,leading to the East Asia monsoon transform and precipitation distribution differences.