Ceramic fiber is a kind of fibrous lightweight refractory material, which has the advantages of light weight, high temperature resistance, good thermal stability, low thermal conductivity, low specific heat and mechanical vibration resistance. Therefore, it is used in machinery, metallurgy, chemical industry, petroleum, ceramics, etc. Glass, electronics and other industries have been widely used. In recent years, due to the rising global energy prices, energy conservation has become China's national strategy. Under such a background, ceramic fibers that are 10-30% more energy efficient than traditional refractory materials such as insulating bricks and pouring materials have gained more in China. More and more applications, the development prospects are very promising.