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Hot deformed NdFeB magnets have attracted much attention not only because of their good magneticproperties but also due to their exceptional corrosion resistance,thermal stability,and fracture toughness.RE-rich phase plays a critical role in the preparation of hot deformed RE-Fe-B magnets.RE-rich phasewould be squeezed,and induce the non-uniform distribution of Nd-rich phase under the effect of severeplastic deformation.It had an important influence on the microstructure,magnetic properties,and plasticdeformation of NdFeB magnets.The understanding the RE-rich phase evolution during preparation is anindispensable step toward the realization of high performance magnets.