The study aims to mold recycled fiber into a board and improve its fire-retardant, and use recycled polyester and polyethylene fiber to add special flame retardants of polyester by 5% 10% 5%,20% different ratio, by mixed and heat-pressed it in to a board .The effect of changing the flame retardants by different radio use to polyester. The experiment at results indicate that we have the best suit fire-retardant was over 15% of flame retardants can coincided the standard of fire-retardant for materials.