The product is made by mixing the main raw materials such as heavy-burned magnesia and other alkaline composite materials with special additives and binders. The product has good sinterability and corrosion resistance, as well as low rebound rate, high adhesion rate, and easy gunning. It is suitable for hot repair of hot zone, slag line, furnace slope, side wall, tap hole and other parts of electric furnace and ultra-high power electric furnace. It is an ideal supporting material to achieve uniform corrosion loss of furnace lining and increase service life.