Abstract: A new type of phosphorus and nitrogen containing flame retardant ---β-（N-phenyl carboxamide)ethyl methyl phosphinic acid (CEMP) was synthesized by the reaction of 2-methy-2,5-dioxo-1,2-oxaphospholane(OP) with aniline. The structure of CEMP was characterized with FTIR and 1H-NMP. The flame retarding performance and glass transition temperature (Tg) of CEMP filled epoxy resin was investigated. The composite containing 20 % CEMP reached the UL 94 V-0 rating with limiting oxygen index value of 29.4 %. The flexural strength of the composite was increased by adding the CEMP, while the flexural modulus and Tg of system were reduced with increasing CEMP.

Key words: β-（N-phenyl carboxamide)ethyl methyl phosphinic acid, flame retardancy, epoxy, composite