Jingbian loess section is located in the transition zone of the mu us sands and loess plateau, and there is a good record of geological environment change. In order to discuss the genesis、provenance and chemical weathering intensity of loess in this region, The geochemical elements of sandaogou section in jingbian county were analyzed and compared with other typical aeolian deposits. The result show that: (1) The average content of Major elements from large to small is SiO2,Al2O3,CaO,Fe2O3,K2O,MgO,Na2O,T-iO2, Sandaogou section has a good correspondence with other typical aeolian deposits and UCC standard curve, which supported the causes of Aeolian in this loess section. (2) During the early weathering stage get rid of Ca and Na in Sandaogou section, the characteristics of element migration in paleosoil are more obvious than loess layer. (3) According to the distribution of element ratios and the analysis of trace elements, there are similar source areas in Sandaogou loess section, Wuwei loess section, Luochuan loess section, Xifeng red clay section and Xiashu loess section. (4) Different areas of loess in the contrast analysis diagram of the Na/k-CIA, Bc-CIA, Ki-CIA, Ba-CIA are distributed in different regions, and it shows that the difference of weathering intensity is correlated with the change of monsoon and the intensity of chemical weathering is consistent with the CIA and A-CN-K charts.