We tried in this endeavor to rebuild the time series of temperature changes in Qinonggou(QNG) of Yangbajing in the southeast of the Tibetan Plateau.It is found that the mercury concentration in peat is a kind of good climatic proxy to monitor the regional temperature changes.The QNG peat recorded the variation in temperature form 9.1kaBP to 3.5kaBP in Holocene and could be divided into three phases: The PhaseⅠ(about 9.1 ~7.2kaBP)was in the Holocene Megathermal stage of high temperature,but started dropping.The PhaseⅡ(about 7.2~5.6kaBP),was the stage with fluctuated temperature changes. There occurred two large cold events happened in 5.9kaBP and 6.3kaBP respectively.The PhaseⅢ(about 5.6 ~3.5kaBP),was a stage showing a falling pattern with violent and frequent fluctuations. They may be correlated with the three events of ice rafted debris(IRD)in the North Atlantic Ocean,i.e. the 8.2,5.9 and 4.2ka events.In addition to them,there were also some cold events in 7.5kaBP,6.3 kaBP and 4.7kaBP respectively.Using REDFIT to make red noise spectrum analysis,we observed from the peat mercury concentration some cycles in aquasi-periods of 1 100,650,450,310 and 110a,as a response to different scales of solar activities,suggesting that the region is much sensitive to the climatic changes caused by solar activities.