Amorphous Fe78Si9B13 specimens have been treated by multiple ultrashort electropulsing with a high current density. The treatment conditions were：1.Keeping the pulse frequency and acting time constant, the current density uninterrupted increases. 2.The pulse frequency increases continuously under constant current density and acting time. The crystallized structures of specimens after electropulsing were investigated by Mssbauer spectroscopy. The results show that the nucleation rate of base metal phase in amorphous specimens increases obviously with the increase of current density and pulse frequency.