The loess-paleosoil sequences in Chinese loess plateau are the excellent archives for studying the magnetic polarity history of the geomagnetic field and reconstructing the paleoprecipitations and paleotemperatures of the north hemisphere in the Quaternary. Their environmental rock magnetic properties recorded the environmental and climatic information since 2.5 million years before the present continuously and sensitively. Especially, being an excellent climatic proxy, magnetic susceptibility has been extensively applied. However, the actual mechanism of susceptibility enhancement remains debatable. Currently, the viewpoint that pedogenesis plays a key role in enhancing magnetic susceptibility of paleosoils has been generally accepted. Some functions of magnetic susceptibilities established by different methods may help to reconstruct the paleoprecipitations and paleotemperatures. Pedogenic magnetite is generally responsible for susceptibility enhancement. Maghemite, meanwhile, is an important contributor to the enhanced susceptibilities of paleosoils. The grain size of magnetic minerals can substantially influence the magnetic susceptibilities too. Additionally, the anisotropy of magnetic susceptibility may be in use of the reconstruction of Quaternary wind field.