Magnesia-calcium brick series magnesia dolomite or dolomite sand, high-purity and dense magnesia as raw materials, designed CaO/MgO according to different use environments, using anhydrous binder, molding at a suitable temperature, and firing at high temperature. The product has strong resistance to external refining slag corrosion, good high temperature resistance, and has the functions of removing lin, desulfurization, and removing non-metallic inclusions, such as clean molten steel. The products are widely used in AOD, VOD, CLU and other smelting devices for smelting stainless steel.