The transport of Co(II) in the sulfuric acid solution through hollow fiber supported liquid membrane containing Cyanex 272 diluted in kerosene was examined. Experiments were performed as a function of aqueous feed solution velocity (1,000 ml/min) for both feed and strip, pH of feed solution in the range of 4.00~6.75, carrier concentration of 25~1,000 mol/m3, and acid concentration in strip solution of 1~500 mol/m3 on cobalt flux. The optimum condition for extraction of cobalt was pH of 6.00, Cyanex 272 concentration of 500 mol/m3 and H2SO4 concentration of 100 mol/m3.