The finished carbon black has a balling rate of more than 95%, high finish, uniform particles, a fineness of more than 350 mesh, a particle size of 0.7-1.5 mm, and a heating reduction of less than 2%. It has a similar strengthening effect (tensile strength) to N550, a similar modulus value (constant tensile stress) to n772, a similar tear strength to N330, and a similar reinforcing effect to n660. In the rubber formula, it not only has a good filling and reinforcing effect, but also can improve the dispersion uniformity of carbon black in the rubber mixture and improve the processing performance of rubber semi-finished products. It has been applied to the inner ply cord rubber, outer ply rubber, sidewall rubber, inner liner rubber and inner tire rubber in nylon bias tire. Without adjusting other ingredients in the above original formula, 20-30 parts by mass replace conventional carbon black such as N550 / 772. In addition, pyrolytic carbon black is also widely used in rubber products such as cables, tapes, seals, rubber rollers, etc.