Abstract: A number of thermochronologic studies have been carried out to investigate the Cenozoic exhumation history of the Longmenshan range，which defines the eastern margin of the Tibet Plateau and is characterized by the paradox of high topographic gradients with but low convergence ratesHowever，the Mesozoic thermal history and the lateral variation of both Cenozoic and Mesozoic uplift of the Longmenshan are not yet well understoodIn this article，we present zircon(ZFT)and apatite(AFT)fission track data for samples collected from three transects along the northern，central and southern Longmenshan Thrust Belt(LMTB).There were several cooling events，revealed by the ZFT and AFT ages，in the Longmenshan region since the Indosinian deformation，ie.,the Late Triassic(～200 Ma)，the end of Early Cretaceous(～100 Ma)，the Early Cenozoic(30～65 Ma)and the Late Miocene(9～15 Ma)eventsAt a regional scale，the Longmenshan experienced a slow cooling between the Mesozoic and Early Cenozoic followed by a rapid cooling since the Middle Miocene，rapid cooling started at 9～15 Ma，with a sharp increase of exhumation rate from <0.1 mm/a to 0.15～0.3 mm/a，up to 0.9 mm/a locallyComparison of ZFT and AFT ages shows that the northern LMTB cooled more rapidly than central and southern LMTB during the Mesozoic，while younger AFT ages indicates more rapid exhumation in central and southern LMTB during the Late CenozoicMultiple thermochronologic data reveal that the Beichuan fault and Pengguan fault have accommodated significant differential exhumation across faults by thrusting activity and associated denudation，with a greater amount of differential exhumation across faults from north to southWe suggest that the major cause for the rapid exhumation of the Longmenshan range during the Late Cenozoic is the thrusting activities superimposed upon the regional uplift of the Tibet Plateau，not necessary the channel flow within the lower crust.