Nanocrystalline　Ni-Fe　alloys　with　different　stacking　fault　energies　were　prepared　by　changing　Fe　content　using　pulse　electrodeposition　method.　The　microstructure　and　mechanical　properties　of　the　nanocrystalline　Ni-Fe　alloys　were　characterized　by　XRD,　TEM　and　tensile　testing.　The　results　indicate　that　all　the　prepared　Ni-Fe　alloys　are　face-centered　cubic　structure,　single-phase　solid　solution　with　the　average　grain　size　in　the　range　of　12-25　nm,　and　the　average　grain　size　decreases　with　decreasing　the　stacking　fault　energy.　The　ultimate　tension　strength　of　the　nanocrystalline　Ni-Fe　alloys　is　in　the　range　of　1361-1978　MPa　and　the　elongation　to　failure　is　in　the　range　of　9.3%-13.2%.　Both　the　ultimate　tension　strength　and　the　elongation　to　failure　increase　with　decreasing　stacking　fault　energy.　The　increase　of　tensile　strength　is　due　to　the　fine-grain　strengthening.　For　Ni-Fe　alloy,　with　decreasing　the　stacking　fault　energy,　the　work　hardening　rate　increases,　and　the　plastic　instability　is　delayed,　consequently　higher　plasticity　is　gained.　©,　2015,　Central　South　University　of　Technology.　All　right　reserved.