Abstract: The plastic deformation mechanism of metallic glasses (MGs) has aroused much interest in the field of material science and condensed matter physics.This paper presents recent results in the study of the plastic deformation mechanism of MGs, including new experimental evidence for the correlation between glass transitions and plastic deformation,and the understanding of their plastic flow in the context of nonequilibrium statistical mechanics.It is found that the plastic deformation can naturally evolve into a self-organized critical state.This may have important implications for understanding the precise deformation mechanism of MGs.