The macromolecule effect of polystyrene sulfonie acid(PSSA)on the polymeriza-tion of aerylamide (AM) has been studied．It was found that the rates of polymeriza-tion of AM were greatly increased in presence of PSSA in the polymerization system．The maximum value of the rate of polymerization of AM was obtained with the ratio of [一SO3H]：[AM] reached to 3：1．When the insoluble PSSA was used instead of the soluble one，the effeet decreased considerably．The interaction between molecules of PSSA and AM was determined by infrared spectrum．element analysis and X-ray electron spectrum．It was found that the combination form．一SO3--NH3-CO一．between sulfonic group and amide group existed．So that the infrared absoption of —NIt

moved from

3400 cm-1 to 3150 cm-1，the binding energy of electron N1s changed from 399.7 eV to 401.3 eV and the atomic ratio of N to S of products Was similar to the ratio of reagents．Based on the experimental results the mechanism of polymerization of AM in presence of PSSA is proposed．The first step is combination of AM with sulfonic group to form—CONH3+．then the AM polymerizes on the PSSA maeromolecule．The role of PSSA on the polymerization of AM is discussed．