Nanocrystalline　Ni　with　a　mean　grain　size　of　27.2　nm　and　a　broad　grain　size　distribution　ranging　from　10　nm　to　120　nm　(B-NC-Ni)　was　prepared　by　direct　current　electrodeposition.　In　tensile　experiments　of　B-NC-Ni,　there　are　two　types　of　engineering　stress-strain　curves　and　macroscopic　fracture.　Results　reveal　that　a　complete　tensile　curve,　i.e.　an　intrinsic　curve,　possesses　a　constant　stress　deformation　stage,　and　macrofracture　is　shear;　a　incomplete　tensile　curve　shows　premature　plastic　instability　before　the　appearance　of　the　flat　plastic　region,　mainly　because　in　the　process　of　nickel　deposition,　flaws　including　vacancies　and　porosity　may　form　in　the　deposit　due　to　the　cathode　hydrogen　evolution,　resulting　in　more　serious　crack　formation　at　the　grain　boundary　during　deformation,　and　the　fracture　is　vertical　shear.　In　addition,　the　effect　of　S　impurities　(0.015　wt%)　on　tensile　properties　can　be　neglected　in　the　present　work.