TECHNOLOGY FOCUS - POLYMERS - Preferred Compound: The monomer is monomer chosen from CF2=CF(SO3R1), CH2=CF(SO3R1) and CF2=CF(O(CF2)1-4SO3R1), monomer having sulfonic-acid ester group and CF2=CF(OCH2(CF2)1-4SO3R1), monomer chosen from CF2=CF(O(CF2)1-4X2, and CF2=CF(OCH2(CF2)1-4X2), and/or monomer chosen from CF2=CF(SO2X1), CH2=CF(SO2X1), CF2=CF(O(CF2)1-4SO2X1) and CF2=CF(OCH2(CF2)1-4SO2X1), preferably 2,4-dimethyl styrene, vinyl toluene, and 4-tert-butyl styrene which are styrene and styrene derivative monomer.X2=bromine or chlorine;andR1=-CH3, -C2H5 or -C(CH3)3.Preferred Composition: A comonomer which is acryl monomer consisting of group chosen from CF2=CR2(COOR3) and CH2-CR2(COOR3), is added in the manufacturing of ion exchange membrane, where R3 is H, -CH3, -C2H5 or -C(CH3)3. monomer of acenapthylene, vinyl ketone CH2=CH(COR4), vinyl ether CH2=CH(OR5), fluorinated vinyl ether CF2=CF(OR5), or CH2=CF(OR5).R4=-CH3, -C2H5 or phenyl;R5=-CnH2n+1, -CH(CH3)2, -CH(CH3)3 or phenyl;andn=1-5.Preferred Material: The high polymer film base material is polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, poly tetrafluoro ethylene, tetrafluoroethylene-hexafluoroethylene-perfluoro-alkyl vinyl ether copolymer film base material, high molecular weight polyethylene, polypropylene, polystyrene, polyamide, aromatic polyamide, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyether ketone, polyether ketone, polyether sulfone, polyphenylene sulfide or polysulfone film base material, or polyimide, polyether imide, polyamidoimide, poly benzimidazole or polyether ether imide film base material. The high polymer film base material has a cross-linked structure. Preferred Method: The graft polymerization is performed by simultaneous graft-polymerizing method, or back graft-polymerizing method. A chlorosulfonic acid is reacted with the perforated film base material, and sulfonic acid group (-SO3H) is introduced into film base-material molecular chain. A cross-linking agent (30 mol% or less) selected from divinylbenzene, triaryl cyanurate, triaryl isocyanurate, 3,5-(trifluoro vinyl) phenol, 3,5-bis (trifluoro vinyloxy) phenol or (CH2=CH(C6H4))2(CH2)n, where n is 1-4, having bis (vinyl phenyl) group is further added during the polymerization process. Further, alpha-methylstyrene and indene, benzofuran or 5-vinyl-2-norbornene is added as monomer. Furthermore, an inorganic substance ultrafine particle (1-30 wt.%) chosen from silica (SiO2) and H+ type mordenite (Ca, Na2, K2) Al2Si10O24x7H2O, fine powder of alumina (Al2SO2), and zirconium oxide (ZrO2), and fine powder (1-30 wt.%) of zirconium phosphate (Zr(HPO4)2xnH2O), phosphorus tungstic acid hydrate (H3PW12O40xnH2O), silicon tungstic-acid hydrate (H4SiW12O40xnH2O) and molybdo phosphoric-acid hydrate (MoO3H_PO4xnH2O) is added to graft monomer solution, and graft polymerized. Preferred Properties: The polymeric ion-exchange membrane has graft ratio of 10-150% and ion exchange capacity of 0.3-2.5 meq/g.