Abstract: The studies for the loess deposits of China have been obviously progressed in recent two decades and many paleoclimatic signals were detected by the analyses of a lot of climatic proxies. An important understanding by now is that the depositional features of the loess are mainly controlled by the paleomonsoon and the variations in summer and winter monsoon strength can be deciphered from the fluctuations of the grain size and magnetic susceptibility of the loess. However, the paleoclimatic proxies of the loess are not yet well understood and more loess sequences need to be studied in detail. Here we report the analysis result of three sections in the vicinity of Beijing region, focusing on the comparison of the variations in the grain size and in susceptibility along the sequence. The results show that the variations in the grain size and susceptibility are not simultaneous both during the deglaciation and glaciation. During glaciations (from paleosol to loess), the grain size exhibits lagged variations than that of the susceptibility. However, during deglaciations, the variations of the grain size either lead or lag that of the susceptibility. Meanwhile, the curve of the susceptibility from S₂ to S₀ (in Zhaogou section) is featured by 100ka cycles (ice volume variation pattern) but the grain size variation has the cycles of the orbital parameters in general. This may imply that the winter monsoon is relevant to the orbital cycles whereas the summer monsoon is cooperated with the ice volume changes. It’s not yet properly explained why the susceptibility and the grain size exhibited different patterns of variations along the loess sequences. The susceptibility of the loess reflected the variations in the strength of the summer monsoon which are controlled by the low latitudes machanisms, whereas the grain size recorded the fluctuations in the winter monsoon winds from high latitudes. The different patterns of variations in the susceptibility and the grain size may imply that the mechanisms that controlled the climate changes of the low latitudes and the high latitudes are different.