A water infiltration experiment，soil porosity and CaCO₃ content determination was conducted at Fengqi in Luochuan of Shaanxi Province on soil profiles of loess and palesol to explore infiltration characteristics and the conditions for groundwater enrichment Results show that stable infiltration rate of Horizon L₄, L₅, L₆and L₇of Loess profile in Xigou, Luochuan, was higher, averaging 0.65 mm min^-1 and the stable infiltration rate of Horizon S₄, S₅, S₆and S₇ was lower, averaging 0.37 mm min^-1. In the loess profile infiltration rate leveled off quickly, generally within 60~90 minutes, while in the palesol it did slower, usually within 90~120 minutes. With higher porosity and higher infiltration rate, the loess had a welldeveloped aquifer, which is attributed to the dynamics of cold-dry climate. Low in porosity and weak in permeability, paleosol tended to form an impermeable layer, which is attributed to the dynamics of warm and humid climate. Attempts were made to fit the three infiltration equations with the data obtained from the infiltration experiment. The three empirical formula commonly used are all applicable to describe infiltration law of loess and paleosol 400 ka~700 ka BP old. The findings of the study have opened up a new field for application of the theory of climatic change in the Quaternary. It is quite clear that the information of climate change in the Pleistocene is of high application value in the study on conditions of enrichment of soil water groundwater and rules of the enrichment, and exploitation of the water resources.