Porous ceramics is a novel material made with physical treatment. The functions of porous ceramics include the following: With the even penetrability of cores, it can be used to produce ceramic filters; Based on the surface area, it can be used to produce porous electrodes and catalyst carriers; With good energy absorbency, it can be used to produce acoustic absorbers and shock absorbers; With low density and low heat conductivity, it can be used to produce thermal materials and lightweight structure materials. Porous ceramics has become popular in various fields and will continue to develop in the future.