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The (Nd1-xMMx)-Fe-B(x=0, 0. :3, 0.5, 0.7, 1) sintered magnets were prepared in this paper by the method of two main phases with Misch-Metal (MM) . The magnetic properties decreased with the increase of MM content. The XRD results show that the phase composition of (Nd1 - x MMx)-Fe-B sintered magnet was still 2: 14: 1 with the increase of MM content. However, ReFe2 phase appeared when the MM content reached 30 wt% and the intensity of the diffraction peak of ReFe2 also increased with the increasing MM content. The micro morphology, element distribution and domain structure of (Nd0.5MM0.5)-Fe-B sintered magnet were analyzed by SEM-EDS, and the results shows that La and Ce elements diffused into some Nd-Fe-B main phase grains in MM containing magnets. The domain structure of the magnet without MM possessed standard bar domains observed by magneto-optical Kerr microscope, while the domain structure of magnet grains with MM tended to maze domains and La and Ce addition promoted the maze domain structure formation. In addition, it is found that transgranular domains were easy to form bet ween the grains lacking rare earth rich phase. [ABSTRACT FROM AUTHOR]