To address the scarcity of modern East Asian Summer Monsoon （EASM） observations， improve dynamical mechanisms and enhance future projection capability， multiple CMIP6-PMIP4 models were adopted to investigate EASM responses to the Holocene Thermal Maximum and current warming， with their differences， mechanisms and controlling factors were clarified. The EASM intensification during the Holocene Thermal Maximum was far stronger than that under current warming， which originates from distinct forcings between the Holocene Thermal Maximum and current warming， and aerosol emissions under current warming further dampen the response amplitude of the EASM. Remarkable EASM intensification occurred during the Holocene Thermal Maximum， featuring increased northern precipitation and reduced southern precipitation. By contrast， weak monsoon responses appeared under current warming with distinct precipitation spatial patterns. Summer land-sea thermal contrast differences dominated such divergent responses. This study elucidates the response law of the EASM to warming driven by distinct external forcings， deepens the understanding of monsoon dynamics， and provides theoretical support for future EASM projection.