Electrochemical　behaviors　of　Fe-Ni　alloy　electrodeposition　in　different　of　Fe2+,　Ni2+,　pH,　temperature,　brightener,　complexant　were　studied　by　the　methods　of　linear　potential　sweep,　cyclic　voltammetery.　From　the　results　it　can　be　concluded　that　when　pH　value　decreased　and　temperature　increased,　the　cathodic　polarization　of　Fe-Ni　alloy　electrodeposition　decreased.　With　increasing　the　concentration　of　Fe2+　and　decreasing　the　concentration　of　Ni2+,　the　cathodic　polarization　increased.　Brightener　and　complexant　played　a　role　of　increasing　cathodic　polarization　and　were　useful　to　make　Ni-Fe　alloy　brighter　and　density.　At　the　same　time　they　could　enhance　corrosion　resistance　of　coatings.　The　apparent　active　energy　of　the　electrode　reaction　of　electrodepositon　Fe-Ni　alloy　coating　within　an　electrode　potential　range　of　-1.0　to　-1.2V　was　calculated　to　be　above　40kJ/mol,　indicating　that　the　electrodepositon　process　of　the　Fe-Ni　alloy　coating　was　dominated　by　electrochemical　polarization.　The　XRD　pattern　showed　that　Ni-Fe　alloy　was　a　solid　solution　with　a　crystal　structure,　the　SEM　pattern　indicated　that　its　appearance　was　smooth　and　bright.