In this work, the average particle size, the degree of monodispersity of particle size and the morphology of γ-Al₂O₃ powder were investigated by changing the type and composition of emulsifiers under O/W emulsion method. Water phase(W) was aq. γ-Al₂O₃ sol of pH=3 and oil containing diverse main surfactants and[or] cosurfactants, which were sp80, tw80, n-butanol, n-octanol and n-dodecanol. The mixing rate & mixing time and the O:W volumetric ratio to form emulsion were 2,000 rpm & ihr and 8:1, respectively. As results, the morphology of γ-Al₂O₃ powder prepared under all conditions was spherical form and the min. average particle size, 0.56 μm, was obtained when mixed surfactants of 2vol.%[sp80 & tw80] of HLBm=5 were used. and the max. monodispersity of particle size, 1.06, was achieved when 0.4vol.%n-butanol, as a cosurfactant, was used with 2vol.%[sp80 & tw80] of HLBm=5.