TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Component: The fiber is glass fiber or ceramic fiber. The glass fiber is alkali-resistant glass fiber or alkali-free glass fiber. The ceramic fiber is natural flint clay fiber or aluminum silicate fiber.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The fiber can be mineral fiber or oxide fiber. The mineral fiber is quartz fiber, silicon carbide fiber or basalt fiber.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The cross-linked structure (I) is formed by forming the cross-linked structure by heat, light and electronic radiations, plasma, X ray or free radical initiator, or under heat, light and electronic radiations in the presence of cross-linking agent(s) (A). The cross-linked structures (II) and (III) are formed by reacting sulfonic acid fluoride, sulfonic acid chloride, or sulfonic acid bromide resins with ammonium, hydrazine, organic diamine or the substances capable of releasing ammonium, hydrazine, or organic diamine after chemical treatment. The cross-linked structure (IV) is formed by processing fluorine-containing sulfonic acid resin via sulfonic acid. The cross-linked structure (V) is formed by fluorine-containing sulfonic acid resin or the fluorine-containing sulfonic acid chloride rein including nitrile group site, sulfonic acid chloride-containing resin and sulfonic acid bromine resin under the heat of acid, which strong protonic acid or Lewis acid. Preferred Component: The solvent is dimethyl formamide, dimethyl acetamide, methyl formamide, dimethyl sulfoxide, N-methyl pyrrolidone, hexamethyl ammonium phosphate, acetone, water, ethanol, methanol, propyl alcohol, isopropyl alcohol, glycol and/or glycerol. The cross-linking agent is a substance of formula X2Rf7X3 (A), ammonium, hydrazine, organic diamine or substances capable of releasing ammonium hydrazine, or organic diamine after chemical treatment. The free radical initiator is azo, or organic peroxide initiator (preferably perfluoro organic peroxide). The substances capable of releasing ammonium, hydrazine, or organic diamine after chemical treatment comprise ammonium, hydrazine, organic or inorganic acid salt of organic diamine, urea or carbamidine. The strong protonic acid is sulfuric acid, trifluoromethanesulfonic acid, or phosphoric acid. The Lewis acid is zinc chloride, ferric chloride, ammonium chloride, organic tin, organic antimony or organic tellurium.X2, X3=Cl, Br, or I;andRf7=perfluoroalkyl or fluorochloroalkyl.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The fiber can be fluorocarbon polymer fiber. The fluorocarbon polymer fiber is PTFE fiber, fluorinated ethylene propylene fiber, self-made fiber (CN101003558A) with ion exchange function or polyperfluoropropyl vinyl ether fiber. The fluorine-containing ion exchange resin is sulfonic acid fluorine, sulfonic acid chloride or sulfonic acid bromine resin. Preferred Dimension: The reinforcing fiber has a diameter of 0.005-50 mu m, and a length of 0.005 mu m-300 nm. The number of the layers of the multi-layer membrane is 2-20. Preferred Composition: The mass ratio of the reinforcing fiber and the fluorine-containing ion exchange resin is 0.1-100:100 (preferably 0.5-50:100). Preferred Method: The step of molding of solution or liquid melt, casting, silk net printing, spray painting or soaking involves dispersing the fluorine-containing ion exchange resin, fiber reinforce, cross-linking agent, acid and/or free radical initiator in a solvent to form a mixture having 1-80 wt.% fluorine-containing ion exchange resin; forming membranes using the prepared solution on a panel or the prepared single-layer or multi-layer membrane by solution casting, solution molding, silk net printing, spray painting or soaking, where during membranes formation, heat treatment is conducted for 10-100 minutes at 30-300 degrees C; and cross-linking during formation of the membranes or after the membranes are formed to form the cross-linking structures. The heat treatment is conducted at 80-250 degrees C for 20-60 minutes. The prepared single-layer or multi-layer membranes are compounded to obtain the fiber reinforced multi-layer fluorine-containing cross-linking ion membrane. The step of the extrusion and hot pressing method of the solution or liquid melt involves preparing mixture of fluorine-containing ion exchange resin, fiber reinforce, cross-linking agent, acid and/or free radical initiator; mixing using a twin screw extruder, internal mixer or roller mixer at 200-280 degrees C; forming membranes from the mixed resin using a screw extruder or a plate vulcanizing machine; and cross-linking during formation of membranes or after the membranes are formed to obtain the cross-linked single-layer membrane. The prepared cross-linked single-layer membranes are compounded to obtain the fiber-reinforced multi-layer fluorine-containing cross-linking ion membrane.