Recent researches have shown that metallic glasses (MGs) can be rejuvenated to a more metastable energy state by thermal or mechanical approaches, which causes a looser atomic packing. This process can effectively improve the overall plasticity of MGs. The present work started with the concept of ageing and rejuvenation of MGs, briefly introducing the probable methods to rejuvenate the MGs, then the advantages and disadvantages of various methods were summarized, and the effects of deep cryogenic cycling method (a non-destructive method to sample morphology and feasible to conduct) were investigated in detail. The effects of treating parameters on the degree of rejuvenation and the effects of rejuvenation on the mechanical and magnetic properties of MGs were also summarized. Finally, some conclusions in this field are drawn and some important questions that deserve further study are put forward.