The effects of the dispersed（0.01-0.03 m/s） and continuous phase velocities(0.02-0.08 m/s) and particle size(1-3 mm) on liquid-liquid interfacial area(a) and mass transfer coefficient(k_c) have been determined in a 0.076 m-I.D.×1.92 m-high Q.V.F. Pyrex glass column. Liquid-liquid interfacial area increases with increasing dispersed velocity, but it decreases with the continuou phase velocity in liquid-liquid three-phase fluidized beds. Mass transfer coefficient increases with increasing the continuous and dispersed phase velocities. The mass transfer coefficient of continuous phase in terms of Sherwood number in liquid-liquid three-phase fluidized beds has been correlated with Schmidt and particle Reynolds numbers based on the energy dissipation rate in the bed.