In this work, polarographic reduction of the Cu(II) complex of schiff base ligand SALH₂. NaNO₃. H₂O was investigated in the solvent media of aqueous 70% Dimethylsulfoxide (DMSO). The reduction of the complex was found to take place in two electrochemical steps indicated by two well - defined polarographic waves. While the first wave involved a two - electron irreversible process, the second wave indicated a one - electron irreversible wave. Also the integral heat of solution ΔHs, of the complex in aqueous 70% DMSO and th standard free energy of activation, ΔG°≠, for each electrode process have been determined by using the polarographic data. Keywords :