Through water infiltration experiment of the L1—S4 layers in Luochuan using the double-ring method and through determination of porosity, magnetization and CaCO3 content, this paper examines the water infiltration difference, the development of the water-containing space and their causes between the loess and the red ancient soil. The results indicate that the stable infiltration rates of the loess layers are bigger than that of the paleosol layers, and the time when the water infiltration reaches a stable condition of loess layers are longer than that of the paleosol layers. Three experience formulas can be used to describe water-seeping rule of the loess and paleosol developed since 400 ka B. P. by fitting of experience data. The results show that climate change of the Pleistocene plays an important part in the enrichment condition and has an important effect on the soil water and groundwater.