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The influence of electropulsing on cementite decomposition in the spherical graphite iron has been studied.The results indicated that the cementite was decomposed in a short time by high current density electropulsing.With increasing electropulsing time, the in situ nucleation of graphite in cementite was accompanied with the quick decomposition of cementite. The dislocation accumulation adjacent to the cementite and the quick diffusion of carbon atom by electropulsing were main reasons for the quick decomposition of cementite. The in situ nucleation of graphite in the cementite resulted from the dislocation climbing crossing the cementite lamellae.