The tail gas filter was made of the material of the porous iron chromium aluminum,the porous nichrome and the porous stainless steel and so on in the high temperature resistant to 1100-1400 degree.They were proved by many companies of European and American.The effect of this kind of material is good in carbon smoke trapping (above 90%).The effect of filters is well, The performance of resists corrosion and the thermostable is prominent.The rate of pore is high (above 90%) and passing the porosity is also high (above 97%). These materials had achieved or surpasses the discharge standard of Europe3 in European and American.