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In this study,a series of Hastelloy tapes were electro-polished,and the dividing method was used to carry out a detailed investigation on the influence of polishing current (Ⅰ) on root mean square (Rq) at various image scales (L).The electro-polishing is found to be effective mainly at L smaller than 10 μm,where the Rq-I relationship could be fitted by an exponential decay function with a residual roughness value.An approximate model of electro-polishing process was established to interpret the exponential decay function.This study provides a quantified insight into the electro-polishing process,which could help to obtain more understanding of its mechanism.