Spherical fine powders of tungsten oxide were prepared by emulsion evaporation method. The characteristics of the powders prepared were examined by means of TGA, XRD, SEM and image analyzer. The emulsions were prepared by vigorous mixing of aqueous phase containing tungsten ion and the organic phase containing kerosene, surfactant and paraffin oil. Precursors were made by evaporating the emulsion in the kerosene bath at 160degreesC and then calcined at 650degreesC. The average particle size of the tungsten oxide powders was 0.6 mum and their shapes were spherical. As the HLB value of the surfactant increased and the concentration of tungsten lions decreased, the mean particle size of tungsten oxide powders decreased whereas agglomeration size increased.