The idea of bi-polar seesaw has persisted for nearly two decades, motivating intensive research of models and records to investigate phase relationship of abrupt climate changes between two hemispheres during the ice ages.The current dating uncertainties and geographically-limited coverage of records, however, make it difficulty to reconcile model-data and anchor their exact phase relationship, leading as yet to no consensus on factors that control the abrupt climate changes through oceanic/atmospheric circulations.Here we present several extensively dated and resolution monsoon records during the last glacial period from three caves in South China, which reinforces the correlation of climatic events between Greenland temperature and East Asian monsoon on centennial-millennial time scales.By allocaring variations of atmosphere methane trapped in bi-polar ice cores on the 230Th dated chronology, we demonstrate that six millennial scale weak monsoon events inversely correlate to, within dating uncertainty, the major warm events at Antarctica between 35~80 ka BP.The synchroneity is further supported by one-to-one assignment of centennial-scale climate variability superimposed on the longer-term trend.Our observation suggests synchronous changes of the subtropical monsoons and bi-polar climates on centennial-millennial scales through strong coupling of intertropical convergence zone (ITCZ) and Adantic oceanic meridional overturning circulations (AMOC), in support of the classic see-saw hypothesis.