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For the sake of rational exploitation and utilization of shallow layer underground saline water, through laboratory infiltration experiment in Nanpi Ecological Experimental Station of Chinese Academy of Science, soil moisture content, salinity, desalting efficiency and cation distribution were analyzed with saline water of 3g/L. Its purpose was to study the soil infiltration characteristics irrigated with saline water in North China. The results showed that under the vertical one-dimensional ponding infiltration with saline water of 3g/L, matric potential was the main driving force of water movement when the infiltration amount was comparatively small; gravity potential gradually replaced the matric potential to become major driving force for water movement when infiltration amount became lager; upper soil would be desalted and soil salt content would increase to reach maximum infiltrated with saline water of 3g/L; relationship between soil salt content in wetting front and infiltration amount according with the exponential function, desalting efficiency of active rooting zone negatively correlated with cumulative infiltration. In short, with saline water was used in farm irrigation, both the effect of salt leaching and the desalting efficiency must be considered to make soil used sustainably.