Super absorbent polymer(SAP) can be used to exploit aeolian sandy soil and improve its quality effectively.The effects of blending SAP to a given depth(5-7 cm) in aeolian sandy soil on vertical infiltration were studied by measuring the four parameters of vertical infiltration rate,accumulated infiltration quantity,lasting time of suck permeability and permeability coefficient.After the infiltration experiment,soil moisture content in different layers was measured to determine the vertical moisture distribution.Results indicated that the vertical infiltration rates of SAIztreated soils were always less than that of untreated soil,accumulated infiltration quantities were increased by about 42%,lasting times of suck permeability were elongated by 134%-390%,and permeability coefficients were decreased by 65%-85%in three different SAP-treated soils.Increase in SAP concentration further accelerated the changes of the four parameters.There was also a conspicuous change in vertical moisture distribution:the moisture content of blending layer was increased by 52%-178%;and it was also increased in the upper soil layer,but decreased in the lower soil layer.The effects of SAP on the vertical infiltration and moisture content of aeolian sandy soil were very notable.