Recrystallized silicon carbide honeycomb ceramic wall flow particle catchers (DPF), is an important part of diesel vehicle exhaust purification device, used to eliminate harmful substances in diesel vehicle exhaust, the principle is to use silicon carbide high temperature resistance characteristics, made into honeycomb ceramic carrier, coated with precious metals and rare earth elements made of composite catalyst. By using the porous thin walls between the interlocking cellular channels, the ultra-fine particles of harmful components such as PM, CO and HC in the exhaust gas of diesel vehicles are captured, and then the emission standards stipulated by the national regulations are achieved through the principle of catalytic combustion. DPF can effectively purify 70%-90% of the particles in the exhaust, which is one of the most effective and direct methods to purify diesel particulate matter, and has been commercialized internationally.