Extraction of lithium ion from aqueous alkaline media by a liquid surfactant membrane was performed using a mixture of LIX54 and TOPO as the extractant. Stripping of lithium from the kerosene solution to the acid solution was suppressed with increasing content of polyamine (EGA) surfactant, The extraction rate of lithium by the Liquid membrane could be interpreted taking account of an interfacial resistance due to EGA. It was confirmed that swelling of the (W/O) emulsion drops by water permeation through the Liquid membrane is evaluated in terms of a change in osmotic pressure gradient between the external and internal aqueous phases during the lithium extraction, In the present operation, the extraction ratio of Li+ from the external feed and the uptake into the internal phase reached as high as 95%.