Intermittent serrated flows of a novel ductile Fe60 Ni20 P13 C7 bulk metallic glass (BMG) at variant strain rates were investigated by statistics analysis.Peak and clutter distribution of slip-avalanche magnitudes are displayed during stable plastic flows at strain rates of 2×10-4 s-1 and 5×10-5 s-1 , respectively, which means that serration behavior depends on the strain rate.However, the remarkable agreement between measured slip-avalanche magnitudes and the scaling behavior, i.e.a universal complementary cumulative distribution function (CCDF) predicted by mean-field theory (MFT) model, indicates that the plasticity of the present Fe-based BMGs can be tuned by imposed strain rates:Smax~?(ε)-λ.This tuned plasticity is eluci-dated with expended free-volume model.Moreover, the scaling behavior of serrated flows for other strain rates can be predicted as well.