Four layers of palaeoflood slackwater deposits(SWD)had been inserted into the Holocene loesspalaeosol stratum at the first terrace land in the Yunxi Reach of the Hanjiang River valley.Palaeoflood SWDs were identified by the variation of Magnetic susceptibility,loss-on-ignition and grain size distribution in the Guixianhekou(GXHK)profile.These results showed that the color of palaeoflood SWDs were grayish or yellow-orange,and abrupt vertical change in particle size,color,structure and texture.The Magnetic susceptibility and loss-on-ignition values of palaeoflood SWDs were lower than those of the adjacent loess and palaeosol.Moreover,the grain size of palaeoflood SWDs were coarser than the adjacent loess and palaeosol.Loess deposits(L_0,Lt and L_1)were sandy silt and palaeosol was clayey silt.Palae of lood SWD3 was silty sand in contrast to palaeoflood SWD1,SWD2 and SWD4were sandy silt,the result why that palaeoflood SWD layers might be developed from different sedimentary process.Palaeoflood SWDs had higher sand content and lower clay content,and their medium size and mean size were obvious larger than loess deposits.These features perfectly showed the presence and sedimentary characteristics of palaeoflood SWD and recorded the occurrence of palaeoflood events.According to OSL dating and stratigraphic correlation with the SJH and QFC profile in the Hanjiang River,four palaeoflood events were dated to 1 000~900aB.P.,3 100~3 000aB.P.,7 500~7 000aB.P.and 12 500~12 400aB.P.,respectively.The four palaeoflood SWDs recorded four extraordinary floods events,corresponding to part of the Holocene abrupt climatic variability during 1 000~900aB.P.,3 100~3 000aB.P.,7 500~7 000aB.P.and 12 500~12 000aB.P.Palaeoflood events at the GXHK site in the upper Hanjiang River provided a regional express on global climate change.