Electric fused magnesia is produced by melting selected natural magnesite or high-purity lightly burned magnesium particles in an electric arc furnace. This product has high purity, large crystal particles, dense structure, strong slag resistance, and good thermal shock stability. It is an excellent high-temperature electrical insulation material and an important raw material for producing high-end magnesia bricks, magnesia carbon bricks, and amorphous refractory materials.