Nanocrystalline　Ni-Fe　alloy　coatings　were　synthesized　by　brush　plating　using　soluble　anode.　Microhardness　test　and　techniques　of　XRD,　SEM　and　TEM　were　applied　to　characterize　the　microstructures　and　mechanical　properties　of　Ni-Fe　alloy　coatings.　The　results　show　that　the　microhardness　of　Ni-Fe　alloy　coatings　increases　with　increasing　annealing　temperature　and　reaches　a　peak　value　at　200C,　showing　a　significant　hardening　during　annealing.　With　further　increasing　annealing　temperature,　the　microhardness　decreases　gradually,　but　the　microhardness　of　the　coating　after　being　annealed　at　400C　is　still　as　high　as　that　of　the　as-deposited　sample.　The　abnormal　grain　growth　is　not　observed　during　annealing　of　Ni-Fe　alloy　coatings,　which　indicates　a　better　thermal　stability.