Pre-cast shapes for EAF roofs have been developed to prolong the service life. They are high alumina based, corundum based and corundum-chrome based. They are featured by easy installation, good integrity, good resistance to arc radiation attack and good thermal shock resistance, compared with brick linings. Better service performance may be achieved by preheating them at 400～600℃. When electrode loop is made of corundum-chrome castable, good resistance to arc radiation attack and long service life can be achieved.