To predict water flow, knowledge of soil hydraulic properties is required. Horizontal infiltration of water into soil columns can be observed in order to determine hydraulic properties. Required physical and mathematical analysis of the observation is based on an integral solution of Richards'equation. The parameters of the soil water characteristic curve are estimated by the observed characteristic length of wetted zone and sorptivity. Unsaturated hydraulic conductivity is estimated from the parameters determined in the soil water characteristic curve and the measurement of saturated hydraulic conductivity. Three soils ranging from sandy loam to clay loam are included in this research. Soil water characteristic curves for the three soils estimaed by the infiltration method are in good agreement with measured soil water characteristic curves. Unsaturated hydraulic conductivity, estimated by the infiltration method for the sandy loam, also compares well with measured values. To further check the method, water content of the three soils are calculated through the numeric method and the integral method based on the calculated hydraulic parameters. The calculation results indicate that the method is accurate.