On the basis of field investigations along the upper Hangjiang River valley,a typical loess-soil section was found at the Tuojiawan(TJW).Magnetic susceptibility and particle-size distribution were measured in laboratory.OSL ages were measured by using the quartz single aliquot regenerative-dose protocol.The OSL results show that the optical ages of these samples ranged in 55.11-13.57 ka BP,showing agood relation with the depth in the TJW profile.It indicated that the profile was formed by loess weathering and accumulation. The content of clay,clay/coarse silt ratio,magnetic susceptibility in 228-260 cm and 294-370 cm were higher than those in Malan loess.The weathering intensity of this depth was obviously higher than that of Malan loess,close to the palaeosol(S_0),belongs to the weak palaeosol(L_1-S_1 and L_1-S_2).The age range of L_1-S_1 and L_1-S_2 was 27.26-21.59 ka BP.The change of the indexes showed the climate and pedogenic environment changed since Pleistocene.It indicated there was a short time of warm and wet in the cold and arid glacial period(27.5-21.5 ka BP),and the southeast monsoon gradually intensified during the early Holocene periods with the strongest monsoon in the mid-Holocene.