Abstract: The cyclic voltammetry was used to study the behavior of Co2+ on Pt and Cu electrodes in melted acetamide-urea-NaBr at 353K.Electroreduction of Co2+ to metallic Co is irreversible in one step.The α and D0 were determined as 0.24 and 3.65×10-5cm2·s-1.While Ce3+ cannot be reduced to Ce directly,but can be inductively codeposited with Co2+.The amorphous Ce-Co alloy films were obtained by potentiostatic electrolysis,and the amount of Ce in Ce-Co alloy increases with increasing of the cathodic overpotential,the molar ratios of Ce(Ⅲ) to Co(Ⅱ) and the electrolysis time.The maximum amount of Ce in alloy film reaches to 64.65%(wt) in the experiment.