Loess-paleosol sequences were recognized as one of the most complete terrestrial records of environmental changes in the past. The research on geochemical properties of loess sediments is meaningful to reveal the chemical weathering intensity of Aeolian loess and its recorded climate change. Field investigations were carried out along the first river terrace of the Danjiang River valley in Shaanxi Province. The Chafangcun profile with loess-soil sequences in the Shangdan Basin was measured for detailed study and the systematical sampling. The stratigraphic and sedimentological features,pedogenic intensity and the profile structure were observed in the field. The contents of trace elements,i. e. Mn,Pb,Ga,Cr,Cu,Ni,As,V,Zn and Ti in soil were measured and analyzed by X-Ray fluorescence as the main climate change indicators. Magnetic susceptibility and Rb /Sr ratio were selected as the supplement indicators. The results are as follows: ① The curves of Mn,Pb,Ga,Cr,Cu,Ni,As,V,Zn and Ti elements were similar with the curves of the Rb /Sr ratio and magnetic susceptibility. There were the highly significant correlations among them,which revealed that the dynamic changes of trace elements were closely related to the climate change and pedogenesis environment; ② The Paleosol layer (S_0) was well defined by very high contents of Mn,Ga,Cr,Cu,Ni,As,V and Zn,suggesting the intensified pedogenic modification to the accumulated dust during a more humid paleoenvironment. It further indicated that the climate was warm and humid during the mid- Holocene optimum. The loess levels (L_1,L_t,L_0) were well defined by lower content of Mn,Ga,Cr,Cu,Ni, As,V and Zn when compared with the paleosol layer (S_0), which suggested that the pedogenic modification to the accumulated dust was weak. It further indicated that the paleoenvironment was cold and dry with frequent dust storms during the periods of loess formation.