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We report the mechanical spectroscopy study of the cold-rolling induced dynamical behavior of crystalline defects in nanocrystalline (NC) nickel The results show that inteal friction (IF) peaks in NC nickel can be induced by cold-rolling.An IF peak,originating from dislocation activity,occurs when the strain is in the range of 9.7- 32.8％.Two Bordoni peaks occur when the strain is 39.0％ and an IF peak associated with deformation twinning appears when the strain is 42.6％.These results mean that deformation of NC nickel is mediated by different kinds of defects as the strain increases.