Quaternary ammonium cornpounds(Cationon UK) were treated onto cotton fabric using a saturation pad method and a foam method, and then the cationized cotton fabrics were dyed with a milling and a levelling type acid dye. Dyeability of the cationized cotton fabrics was discussed in terms of the reflectance properties and K/S values of the dyed samples. It was found that, for the cationization of cotton fabrics, the foam method was more effective than the saturation pad method.