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The kinetics of La-Co alloy film in acetamide-urea-NaBr molten salt electrolyte at 353 K was investigated. It is shown that the reduction of Co( Ⅱ ) to Co is irreversible reaction with the transfer coefficient of 0.28 and the diffusion coefficient of 7.46 × 10-5cm2/s. While La( Ⅲ ) cannot be reduced to La directly; but can be codeposited with cobalt. The content of La in the uncrystallized La-Co alloy film increases with increasing cathodic overpotential, molar ratio of La3+ to Co2+ and electrolysis time as well, and reaches the maximum of 66.32%.