A phosphazene derivative with long chain hex( octylamino) cyclotriphosphazene( HOCP) was synthesized as flame retardant and compatibilizer,and its composition and structure were evaluated by FT-IR,NMR and elemental analysis. The new HOCP was used as flame retardant for ethylene vinyl acetate( EVA) filled with ammonium polyphosphate( APP) and Trimer. The effects of HOCP on the flame retardancy and compatibilization of EVA were studied by the limiting oxygen index( LOI),UL-94 tests,mechanical tests and rotati...