<,正,>,A phosphrous-containing poly（aryl ether ketone）was synthesized derived from bisphenol-A and bis[4-（4- fluorobenzoyl）phenyl] phenyl phosphine oxide（FPPPO）by nucleophilic substitution reaction.The structure of the polymer was characterized by FT-IR,1,H-NMR and ,31,p-NMR.The thermal property of the PAEK was measured by DSC and TGA. The glass transition temperature（T,g,）of the polymer was 205℃,and the 5% weight loss temperature under nitrogen was 475℃.Good solubility of the polymer in organic solvents,such as N-methylpyrrolidone,dimethylformamide, dimethylacetamide,dimethylsulfoxide and chloroalkanes was observed,flexible film was obtained from the polymer’s CH,2,Cl,2, solution.The limiting oxygen index（LOI）of the PAEK was 40,which indicated that organic phosphorus moiety can offer good flame retardant property to the polymer.