The technique of supported liquid membranes (SLM) was used to achieve the facilitated extraction of Cu(II) ions from acidic solutions, with triocthyl amine (TOA), methyl Cholate (MC) and Tri-n-octyl phosphine oxide (TOPO) as carriers , toluene as organic phase and a flat film of polyvinylidene difluoride (PVDF) as hydrophobic support (0.45 μm pore) . The macroscopic parameters, permeability P and initial flux J 0 related to facilitated extraction of these ions have been determined, for the three carriers and different concentrations of Cu (II) ions, a net evolution of these parameters, were observed. To explain this facilitated transport and extraction phenomenon of these ions by this membrane type (SLM), a mechanism based on the complexation of Cu (II) ions by the carrier and the diffusion of the formed complex through the SLM organic phase has been developed. Experimental results verify the mechanism and allow to find the optimum carrier, and to determine the values of microscopic parameters, association constant K ass and apparent diffusion coefficient D*, relating to the migration of the complex substrate-carrier, through the membrane organic phase.