The glass fiber needle punched felt is one kind of high temperature resistant filter material with reasonable structure and excellent performance, it could be high temperature resistant, anti-abrasion, stable size, little elongation shrinkage ratio, high intension, also ultimate fiber of felt layer fiber, three-dimensional micro porestructure, high porosity, small filter resistance to gas, it has higher speed and efficiency. Comparing wit-h other high temperature resistant chemical fiber felt, it has the advantage of lower price, higher temperature resistant. Glass fiber needle punched felt are widely used in the field of chemical, steel iron, melting, carbon black, electricity, cement etc and all kinds of filter bag.