The loess layer of Dazhan formation is widely developed under Holocene strata in Wanjia to Lancun area in the middle of Jiaolai basin. However, in the past, the level of attention and research on it has been relatively low. In order to study the characteristics of loess in the middle of Jiaolai basin, a series of research work on Qigezhuang section of Jiaolai basin has been carried out, including geological profile measurement, photoluminescence dating, spore pollen analysis, and whole rock constant geochemical research. It is showed that the loess profile in Qigezhuang is mainly composed of silt, with quartz gravel at the bottom. It reflects the genetic characteristics of loess with aeolian and near source alluvial deposits. The results of photoluminescence dating limit the sedimentation time of loess is （89.3±5.6） ka to （33.8±3.3） ka, and its formation period is the Pleistocene Sarawus period. Spore analysis shows that the profile is mainly composed of herbaceous pollen, with rare pollen combinations, such as pine, quinoa and fern, and occasional freshwater algae. This reflects the arid desert climate of the Jiaolai Basin in the late Pleistocene. The geochemical characteristics of the whole rock show SiO2>Al2O3>CaO>Na2O>K2O>Fe2O3>MgO>TiO2>P2O5>MnO. Comparing with typical regonal loess, CIA shows that the loess is in the stage of primary chemical weathering. The significance of loess provenance and paleoenvironment has been studied. It will provide some references for the study of loess sedimentation in Jiaolai basin and even in Shandong province.