In view of the expanded polystyrene plastic board (EPS) was a kind of widely used building insulation materials, but itself was combustible. Based on this problem, by adding flame retardant EPS plate and the EPS board exterior coating fire protection, improved the monomer flame retardant performance of EPS board, reduced the possibility of its combustion, improved the performance of the EPS board with fire, so as to improve the safety of its use as building insulation materials.