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The morphology analysis and electrochemical method were used to study the corrosion behavior of LaFe11.6Si1.4 alloy of copper ion implantation.X-ray photoelectron spectroscopy (XPS) and atomic emission spectroscopy (AES) research results showed that a 15 nm-thick oxide film was formed on the surface of sample,and the copper content reached the highest value at 60 nm with a normal distribution.Immersion experiments indicated that the corrosion happened in the copper-poor zone firstly and a galvanic connection was formed among different zones on the surface due to the inhomogeneous distribution of copper.Electrochemical experiment results showed that the corrosion was serious when the ion acceleration voltage increased,and the high acceleration could reduce the thermodynamic performance of corrosion of LaFe11.6Si1.4 alloy.