The carbon isotope time series during 65~90ka BP was reconstructed with the 230Th dating data and carbon isotope record of the Y02 stalagmites in the Yangzi Cave in the Three Gorges Reservoir Area,Fengdu.The carbon isotope record of the Y02 stalagmites in Yangzi Cave revealed that in the MIS5b-to-MIS5a transformation process the monsoon changed gradually and D/O21 was of a bimodal structure,which was different from the stalagmite records in the Sanbao Cave and the Wanxiang Cave and might be related to the location of the Yangzi Cave and the Y02 resolution.The delta~(13)C record of Y02 did not record the 72ka BP Toba volcanic eruption,so Toba volcano was not the dominant factor to the 72ka BP cooling event.Power spectrum analysis of the carbon isotope showed that 290,229,196,115,100and 93a cycles existed in the delta~(13)C of Y02 stalagmite record,which coincided with the solar activity cycle.The carbon isotope record of Y02appeared to be consistent with the change trend of the solar radiation curve in the northern hemisphere,which gave a further proof of the hypothesis that climate change of East Asian monsoon area is a direct response to changes of solar radiation in northern hemisphere during the transition from the last interglacial to the last glacial period.