Field work was carried out systematically on one loess section at Buxi of Zhangqiu in Shandong Province. Grain size, magnetic susceptibility and optically stimulated luminescence (OSL) dating of Buxi loess section were conducted. Results indicate that: (1) According to Sahu's discrimination formula, it is found that the main sedimentary deposits are formed in aeolian environment. By analyzing grain- size class vs. standard deviation values method, environment-sensitive size fractions of this section are 7.08-8.91 mum and 39.81-50.12 mum respectively; (2) Changes of magnetic susceptibility and percentages of different size fractions are correlated. In this section, the quality of low- frequency and high- frequency magnetic susceptibility changes in the range of: 32.38*10~(-8)-138.46*10~(-8) m~3 kg~(-1) and 30.62*10~(-8)-123.31*10~(-8) m~3 kg~(-1) (ranges from A to B). The change of magnetic susceptibility can reflect the palaeoclimate variation information to some extent; (3) The section is divided into three loess layers and three paleosol layers, which records the information of climatic change and environmental evolution over the last interglacial stage.