Through integrated analysis of the chroma parameters,magnetic susceptibility,grain size and Rb/Sr ratio of the Tuojiawan loess-paleosol profile in Yunxi County,the correlation between the features of chroma parameters and palaeoclimatic change in the upper reaches of Hanjiang River was revealed.The results showed that:a~* was strongly positively correlated with the content of iron oxide,and the average value of a~* was significantly different between loess and paleosol layers,and followed the order of S0(6.34) >MS(5.52)>L_t(5.18)>L_0(4.98)>L_1(4.82)>T_(1-al_2)(3.66).L~* was negatively correlated with the content of iron oxide and organic matter,with iron oxide having agreater effect on L~*,which reached the peak in the loess layers.h~* was the lowest(68.64°)in the paleosol layers,but was high in the loess layers.In contrast, a~*/b~* was high in the paleosol layers(0.39),but was low in the loess layers.In Malan Loess,there were two weak paleosol layers,i.e.L_1-S_2 and L_1-S_1,which showed higher a~* and a~*/b~*,but lower L~* and h~* than Malan Loess.h~*,a~*/b~*,L~* and a~* could be used as good indicators of climatic change.A high a~* and a~*/b~*,or a low L~* and h~* indicated that the climate was warm and wet,and the pedogenesis was strong.In conclusion,h~*,a~*/b~*,L~* and a~* together recorded the climatic evolution since the late Pleistocene:the climatic was cold and dry during the late Pleistocene,but a short warm and wet period happened in the glacial period(27.5-21.5ka B.P.),then the climatic gradually became warm and humid during the early-mid Holocene.However,cold and dry climate appeared again since the late Holocene in the region.