Abstract:In order to analyze the effect of air-permeable and water-proof soil on water infiltration and solute transport,an one-dimensional vertical soil column infiltration test was carried out with different bulk densities (1.40,1.45,1.50,1.60 g/cm3). The results showed that the air-permeable and water-proof (weak permeable) buried body could increase the cumulative infiltration of soil and promote the migration of wetting front. In a certain range,with the increases of the bulk densities of the air-permeable and water-proof (weak permeable) buried body,both the infiltration rate and the migration rate of wetting front increased. When the infiltration time was 600 min,the cumulative infiltration of soil increased by 7.42%~29.17%,and the depth of wetting front reached 27 cm. The infiltration time decreased by 26.97%~64.27% correspondingly. Compared with the control group,the amount of solute migration to the deep soil was reduced by different bulk densities of the air-permeable and water-proof (weak permeable) buried body. Both Philip model and algebraic model could describe the infiltration process of soil water in the air-permeable and water-proof (weak permeable) buried body,and the permeability s in Philip model and the comprehensive shape coefficient α in the algebraic model were positively correlated with the volume weight ratio and the volume weight ratio inside and outside the air-permeable and water-proof (weak permeable) buried body. The results showed that the air-permeable and water-proof (weak permeable) buried body could improve the water infiltration capacity and solute transport by changing the suction distribution of the upper soil,and realize the regulation and purification of urban rainwater runoff.