Micellar properties of binary mixed surfactants of a surface active mixed copper(II) chelate, [Cu(C-12-tmed)(acac)Cl] (where C-12-tmed is N,N,N'-trimethyl-N'-dodecylethylenediamine) with three common surfactants, viz, sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide(CTAB), and octaethylene glycol monododecyl ether (C,,Es), were investigated by surface tensiometry, ESR, and W-visible absorption techniques, The surface tension data were treated with Rubingh's method for mixed micelle formation and Rosen's method for mixed monolayer formation at the aqueous solution/air interface, It was found that in the mixed micelle there is strong attractive interaction between cationic copper surfactant and anonic dodecyl sulfate while there is almost ideal mi;mixing between copper surfactant and CTAB and C12E8. From the ESR and UV-visible studies, a mixed block-type arrangement of head groups is proposed.