Using　our　recently　developed　in　situ　transmission　electron　microscopy　techniques,　we　revealed　that　the　FCC　structured　Ni　nanowires　with　diameter　of　about　30　nm　possess　ultra-large　strain　plasticity.　Dynamic　complex　dislocation　activities　mediated　the　large　strain　bent-plasticity　and　they　were　monitored　at　atomic　scale　in　real　time.　The　bent-induced　strain　gradient　allows　studying　the　strain　effects　on　dislocation　mediated　plasticity.　We　also　explored　the　deformation　techniques　to　more　general　cases,　the　nano　thin　films.　An　example　of　tensile　Pt　ultra-thin　film　is　presented.