The
    different grain size content range from 0.5~500 μm and magnetic susceptibility
    were measured to study the correlation between grain size and magnetic
    susceptibility,  selected more 590
    samples,  in sediments from Core
    Changping. The results show that magnetic susceptibility of the profile is of
    some relationship with that of the content of different grain sizes,  the correlation coefficient between
    susceptibility and the mean grain size is positive for the whole core. The
    magnetic minerals are mainly concentrated in fractions with coaster grains.
    Furthermore,  the correlation between
    grain size and magnetic susceptibility is also affected by sediment source,  the degree of sorting process and so on. The
    correlation coefficient of susceptibility with the content of 0.5~30 μm,  especially 0.5~10 μm,  is negative,  and with the content of 65~500 μm is positive,
     dominated by large particles of magnetic
    minerals in the core. In addition,  the
    correlation is different in various depth. Due to the different condition of lake
    and aggregation,  the correlation between
    magnetic susceptibility and grain sizes should be analyzed depending on
    deferent sedimental environment. When the strong hydrodynamic,  magnetic susceptibility are relatively large,  and relatively weak,  the magnetic susceptibility is relatively
    small. Therefore,  the grain size and
    magnetic susceptibility changes to reflect the changes in hydrodynamic
    conditions,  indicating that changes in
    the strength of the East Asian monsoon. Especially,  the climate cycle from the Quaternary period,  the to-and-fro of the glaciation and
    interglaciation,  we concluded that 
    data and magnetic susceptibility,  particle size and get paleoclimate information
    of the drilling: 1100~800 ka B.P. is mainly cool and there is a small heating between
    them,  800~600 ka B.P. cool and warm
    alternate in temperature,  600~400 ka
    B.P. climate is prior to hot and humid,  400~200 ka B.P. climate is prior to cold and
    dry,  200~0 ka B.P. climate is priority
    to cool alternate fluctuation. Research shows that the core may reflect the
    8~10 climatic cyclicities. The area of precipitation increases in humid climate
    period,  with alluvial deposits
    containing more coarse particles and larger magnetic susceptibility. The
    fluctuations of susceptibility indicate the changes of paleoclimate.