Springback　is　one　of　the　most　interesting　mechanical　phenomena　for　bent　metals　after　stress/strain　release.　Most　previous　studies　investigate　the　springback　behaviors　of　metals　only　with　low　bending　angles;　rarely　do　studies　investigate　these　metals　under　large　bending　angles.　Here,　we　investigated　the　springback　behaviors　of　twinstructured　Ni　nanowires　(NWs)　at　various　bending　angles　through　in-situ　experiments　and　molecular　dynamics　(MD)　simulations.　We　discovered　that　the　springback　angle　and　deformation　mode　of　twin-structured　Ni　NWs　can　be　divided　into　three　stages,　which　have　rarely　been　reported.　The　results　revealed　that,　as　the　maximum　bending　angle　increases,　the　plasticity　of　the　NWs　transfers　from　partial　dislocations　parallel　to　the　twin　boundaries　(TBs)　to　extended　and　full　dislocations　on　multiple　slip　systems,　and　then　to　grain　boundary　(GB)　generation.　Unlike　previous　studies　which　suggested　that　deformation-induced　dislocations　and　GBs　are　irreversible,　our　results　show　that　these　defects　are　reversible　upon　unloading.　The　different　recoverable　abilities　of　these　deformation-induced　defects　lead　to　a　bending-angle-dependent　springback　phenomenon.