Abstract: Two methods to analyze polarization curves of Ni-Fe alloy codeposition were established by using ring-disk electrode based upon the limiting electricity quantity of electrooxidation of Fe~(2+) ions on ring electrode and the shielding effect on the above ring electrode process by electrorcduetion of Fe~(2+) ions on disk electrode respectively. The kinetics of Ni-Fe codeposition on Hg, Ni, Fe and Ni-Fe alloy electrodes had been investigated. The results showed that Ni~(2+) and Fe~(2+) were electrodeposited on Hg electrode with the same kinetics as they were electrodeposited individually, but Ni~(2+) was electrodeposited activably on Fe electrode, and the electrodeposition of Fe~(2+) on Ni electrode was inhibited. The mechanism of codeposition of Ni—Fe alloy had been discussed.