Abstract:Recent progresses in our group’s research on the variabilities of East Asian monsoon climate system(EAMCS) and the occurring mechanism of severe climate disasters in China are reviewed in this paper. Firstly,the temporal-spatial variations and anomalies of the East Asian monsoon system have been revealed from the analyses of observed data. Moreover,the impacts and their processes of the tropical oceans,the land process in arid and semi-arid region and snow cover over the Tibetan Plateau on the East Asian monsoon system are studied from analyses,dynamical theories and numerical simulations,respectively,thus,a new concept of the EASMS and the internal dynamical mechanism of this system are proposed. And a climatological conceptive model of the occurrence of severe floods in the Yangtze River and the climate background of prolonged droughts in North China are put forward from the interannual and interdecadal variations of the EAMCS. Besides,some scientific issues related to the EAMCS,which should be studied urgently,are also suggested in this paper.