Abstract: With increasing ecological and environmental concerns，the use of halogenated flame-retardants are being limited and halogen-free alternatives will be developed rapidly. Resorcinol bis (dipheny1 phosphate) (RDP) is a non-halogen aromatic oligomeric phosphate flame-retardant and flow modifier. Its high thermal stability and low volatility make it ideal for use in applications where high processing temperatures are required. In this paper，RDP was used as a single flame retardant of resilience polyurethane foam，and used together with exfoliated graphite (EG) as synergistic flame retardant. The limited oxygen index (LOI) of foam specimen was tested according to the GB 2406—80 standard and vertical flammability was tested in terms of CCAR25.853 (b) Flammability Teat Method.