Abstract: In order to improve the grade of fused magnesite and make rational use of resources，fused magnesite was prepared with magnesite as raw material.The influence of different graphite electrodes，such as DC hollow electrode，DC solid elec trode，AC hollow electrode and AC solid electrode，on fused magnesite were studied.The volume density，apparent porosity，phase composition and microstructure of the fused magnesite were analyzed.Result showed that the best crystallization is in the position near the coarse pert，and the crystal development is relatively complete.The fused magnesite prepared with hollow electrode has compact structure and large grain size.The largest volume density，low porosity，straight grain boundary and larger grain size were obtained by AC hollow electrode.

Key words: fused magnesite；melting process；crystallize