The rational manufacture and selection of lightweight high-alumina bricks are of great significance to the rational use of energy and the correct implementation of China's energy policies. Among various lightweight insulation materials, lightweight high-alumina bricks have high refractoriness and small bulk density; raw materials are abundant, and refractory bricks are inexpensive, which is an ideal heat insulation material. According to the manufacturing process, lightweight high-alumina bricks can be made by foaming or adding a person.