The research on soil water infiltration is of great significance to the acquisition of a better knowledge of hydrological circulation of the watershed.A water-wind erosion interlaced region is a place where the most serious soil and water loss happens on the Loess Plateau, and any study on soil infiltration properties and on their spat ial variability of this region will do help to expose process of the soil erosion and improve precision of the watershed hydrological model.Of a natural slope (380 m long) in the Liudaogou catchment, which is typical of the water wind erosion interlaced region, stable infiltration rate, mean infiltration rate and cumulate infiltration capacity within the initial 30 min were measured with a double ring infiltrometer at 57 sampling sites, and the data were analyzed with both the traditional statistical method and the geostatistical method combined with the fractal theory.The results indicate: (1) the coefficient of variation of the above three parameters was respectively 0.48, 0.36 and 0.40 and the spatial variability was medium in degree;(2) the fractal dimension of the three parameters was 1.88, 1.92 and 1.85, respectively, which shows that the difference was rather small between soil samples in values of the soil infiltration properties;and(3) the soil was not a medium with significant theoretical fractal phenomenon, and fractal features existed only in a specific range of space, and the range of spatial autocorrelation for stable infiltration rate, mean infiltration rate and cumulate infiltration capacity within the initial 30 min was 20~120 m, 20~140 m and 40~100 m, respectively.