difluorodibenzophenone is prepared based on fluorophenyl and carbon tetrachloride, using anhydrous aluminum muriate as catalyzer.Polyether ether ketones are prepared by the nucleophilic reaction of hydroquinone with 4,4’-difluorodibenzophenone using diphenylsulfone as solvent in the presence of anhydrous K₂CO₃/Na₂CO₃;the effect of the reaction temperature on molecular weights is discussed.The polymers are characterized by IR,DSC and TG,and the struction is proved to be PEEK.TG studies show the polymer is stable up to 541℃ with a char yield at 1200℃ in N_2atmosphere;the DSC studies show the melting point of the polymer is 335.67℃.