Abstract: In acidic or basic buffer solution, nuclear fast red (NFR) exhibits an adsorptive wave. The electrode processes have been verified as an ECE mechanism. The rate constant of the first order chemical reaction following electrochemical reaction has been measured by means of cyclic voltammetry. At pH 4.75, on the surface of mercury electrode, the adsorption of NFR obeys Frumkin isotherm. The adsorption coefficient β= 7.2×10~6 and the interaction factor υ=0.39 have been determined. In the supporting electrolyte containing 0.1 mol·L~(-1) ethylene diamine and 0.3 mol·L~(-1) KCl, at pH 11, the polarographic adsorptive complex wave of RE(III)-NFR has been obtained by using single-sweep polarograph. The electrode processes has been studied.