The preparation and characterization of functional polymeric active materials for ion selective electrodes by radiation graft of acrylic acid onto polystyrene were studied. The SO,4,-, ion selective electrode using functional polymer materials containing SO,4,-, active group obtained from radiation graft copolymerization as active materials were prepared. Its functional curve is linear in 10,-1,—10,-3, mol/L in Na,2,SO,4, solution with the slope 52 mV/,http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=42650432&type=,http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=42650434&type=,http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=42650443&type=,. The response time is ,<,70 s. The chloride electrode was made with functional polymer as active materials. This electrode exhibited Nernstion response in 10,-1,—2×10,-4,mol/L Cl,-, solution with 8× 10,-5, mol/L minimum measurement concentration. Its response time is,<,5 s, whose resistance is ,<,60 kΩ. The properties of the rare earth ion selective electrodes prepared by these polymeric active materials were reported. It has better linear relationship between E and PC, better stability, faster response and selectivity than that of ones obtained by chemical method and irradiation method.