TECHNOLOGY FOCUS - POLYMERS - Preferred Membrane: In the ion membrane above, the fiber used as the reinforcer is selected from alkali-resisting glass fiber, alkali-free glass fiber, polytetrafluoroethylene fiber, fluorinated ethylene propylene fiber, fiber with ion exchange function prepared from the current technique CN101003588A, fluorinated propyl vinyl ether fiber, fluorocarbon polymer fiber, ceramic fiber, mineral fiber and oxide fiber.Assisted proton transmitter is selected from silicon dioxide (SiO2), zirconium oxide (ZrO2), titanium oxide (TiO2), boron phosphate (BPO4), zirconium phosphate (Zr3(PO4)4), zirconium biphosphate (Zr(HPO4)2), H3PW12O40, cesium biphosphate (CsHPO4), cesium dihydrogen phosphate (CsH2PO4), H-mordenite, H-montmorillonite, HZr2(PO4)3, Zr3(PO4)4, cerium biphosphate (Ce(HPO4)2), titanium biphosphate (Ti(HPO4)2) and Zr2H(P3O10)2. The microporous membrane is selected from bulk polytetrafluoroethylene film, microporous polytetrafluoroethylene- perfluoropropylene film, porous polyimide film, SiO2 film, TiO2 film, ZrO2 film, aluminum oxide (Al2O3) film and porous glass film. The metal elements of the high valent metal compound is selected from tungsten (W), iridium (Ir), yttrium (Y), manganese (Mn), ruthenium (Ru), vanadium (V), zinc (Zn) and lanthanum (La).The high valent metal compound is capable of being loaded on the assisted proton transmitters and/or the reinforced fiber; the high valent metal compound is selected from one or composite salt of nitrate, sulfate, carbonate, phosphate or acetate in the highest and middle valence states of the metal elements; or the high valent metal compound is selected from cyclodextrin, crown ether, acetylacetone, nitrogen-containing crown ether, nitrogen-containing heterocycle, EDTA, dimethylformammide (DMF), dimethylsulfoxide (DMSO) complex in the highest and middle valence states of the metal elements; the high valent metal compound is selected from hydroxides in the highest and middle valence states of the metal elements; or the high valent metal compound is selected from oxides with perovskite structure in the highest and middle valence states of the metal elements, and comprises but not only comprises the following components: CexTi(1-x)O2 (x = 0.25-0.4), Ca0.6La0.27TiO3, La(1-y)CeyMnO3 (y = 0.1-0.4) or La0.7Ce0.15Ca0.15MnO3.