This paper synthesized the flame retardant agents of tri(2,3-dibromo-propyl)phosphate and ammonium polyphosphate,etc. Formulas of flame retardant polyurethanefoaming plastics were studied by orthogonal plan method.The experimental resultsshown that the horizontal burning rate and the oxygen-index of fire retardantpolyurethane foaming plastics were 0. 012cm/s and 26,respectively.