The Box Furnace adopts a double-layer shell structure and a Yudian program temperature control system. This Box furnace is made of alumina polycrystalline fiber material. The double-layer industrial box furnace shell is equipped with an air cooling system for rapid temperature changes for the Box Furnace. The high temperature box furnace has functions such as over temperature, broken couple, and over current protection. It finds applications in universities, scientific research institutes, and industrial and mining enterprises.