The　bulk　Ni　with　various　grain　sizes　were　prepared　by　direct　current　or　pulse　electrodeposition,　respectively,　in　the　nickel　sulfamate　electrolyte.　The　uniaxial　tensile　tests　were　performed　at　room　temperature　to　compare　the　mechanical　properties　among　these　Ni　samples.　The　results　show　that　the　ductility　in　electrodeposited　nanocrystalline　(NC)　Ni　can　be　significantly　enhanced　with　a　higher　strength　by　extending　the　grain　size　distribution.　The　NC　Ni　samples　with　a　broad　grain　size　distribution　(5-120　nm)　and　an　average　grain　size　of　27.2　nm　have　an　ultimate　tensile　strength　(σUTS)　of　1162-1211　MPa　and　an　elongation　to　failure　(δETF)　of　10.4%-11.4%.　Compared　with　the　NC　Ni　samples　that　have　a　narrow　grain　size　distribution　(5-60　nm)　and　an　average　grain　size　of　22.4　nm,　the　σUTS　of　NC　Ni　with　a　broad　grain　size　distribution　decreases　by　200　MPa,　but　the　δETF　increases　by　3.4%.　By　the　TEM　observations　of　the　microstructures　in　NC　Ni,　it　is　revealed　that　the　apparent　enhancement　of　ductility　in　NC　Ni　with　a　broad　grain　size　distribution　results　from　the　presence　of　intragranular　dislocation　sliding　in　the　large　grains　(above　100　nm)　during　plastic　deformation,　similar　to　that　in　conventional　coarse-grained　materials.