In the present work, the cyclic voltammetry of sodium aurate was examined alone and with KMnO₄ in HNO₃ as supporting electrolyte using glassy carbon working electrode.The study is valuable for evaluating the thermodynamic properties. In absence of KMnO₄, adding different concentration of AuCl₄^- ions to HNO₃ gave redox waves. In the reduction effect, the nitrate was increased indicating catalytic peak. While in oxidation effect of Au⁰ to Au⁺³ gave broad peak. In presence of KMnO₄, all cyclic voltammetric data are greater in most parameters. The electron transfer rate constant resulting from the interaction of KMnO₄ on NaAuCl₄ were evaluated and their data were discussed.