Abstract: It has a great significance to study the effect of initial soil salt content on the infiltration of soil water for improving salinealkaline soil. A onedimensional vertical leaching experiment was carried out under different initial soil sodium chloride contents (3.6, 4.5, 5.3, 5.7 g•kg^-1 and 9.0 g•kg^-1) in laboratory. According the experiment data, the quantitative relationships between the wetting front, cumulative infiltration and time and the soil salt content were developed using the multiple regression analysis. The regression correlation coefficients were 0.992 and 0.922, and the fitting results of the regression model were good. According to the cumulative infiltration, the quantitative relationships between the infiltration rate and time and soil salt content were obtained. The analyzed result showed that the effect of initial soil salt content on the infiltration of soil water was higher than that of time. The higher the initial soil salt content was, the lower the values of wetting front, cumulative infiltration and infiltration rate would be.