The invention relates to a friction material used in express train brake and its method for preparing. The materials include rubber, gum cement, resin, friction-type mix, fibrous material and mineral filler. It is characterized in that the materials also include tripoly cyanoamine cyanurate, mineral filler, didymia rare-earth powdered ore, lanthanum chlor rare earth powdered ore, the proportion of the weight part of each component is: rubber of 5-10 parts,fibrous material of 8-13 parts, gum cement of 0.2-0.6 part, mineral filler of 2-7 parts,resin of 5-12 parts, tripoly cyanoamine cyanurate of 0.5-1 parts,and friction-type mix of 40-50 parts. The method for preparing includes preparing moulded materials, compression molding and after-treatment. The invention reduces the high-temperature degeneracy of the friction material because it has selected tripoly cyanoamine cyanurate which has self-lubricating property and is of good fire-retardancy as addition agent and improves the cooperating knife-bar among gasket materials because it has added rare-earth powdered ore. The method for preparing moulded materials adopting rubber-making technology is of simple technology and suitable for commercial manufacture, and is of zero environmental contamination, zero noise and nuisance free.