TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Units: The structural unit (a) is hetero aromatic compound containing at least one group chosen from pyrrole, pyrazole, pyridine, pyrazine, pyrimidine, pyridazine, quinoline, isoquinoline, quinoxaline, imidazole, benzimidazole, indole, purine, triazole, triazine, furan, thiophene, benzofuran and their derivatives. The structural unit (a) contains group of formula (1,2,3 and/or 4).A = direct bond, -O-, -S-, -S(O)-, -S(O)2-, -C(O)-, -P(O)(C6H5)-, -C(CH3)2-, -C(CF3)2-, 9,9-fluorenylidene group, -C6H4-C6H4-, -C(C6H5)2-, -C(=CH2)-, or 1-6C alkylene group;R = H, 1-6C aliphatic group, phenyl group, phenoxy group, nitro group, cyano group, 1-6C alkoxy group, chlorine, bromine or iodine;X = proton acid group containing SO3H, COOH or PO3H2;n = 1-5;m = 5-n;Y = direct bond, -O-, -NH-, -N(CH3)- or 1-6C alkylene group;Z = direct bond, -NH-, -N(CH3)-, -O-, -S-, -S(O)-, -S(O)2-, -C(O)-, or 1-6C alkylene group;B = 1-6C alkylene group;W = direct bond, -O-, -S-, -S(O)-, -S(O)2-, -C(O)-, 1-6C alkylene group or -N(Q)-; andQ = H, 1-6C aliphatic group, phenyl group, nitrophenyl group, alkoxy phenyl group, fluorophenyl group, chlorophenyl group, bromophenyl group, iodo phenyl group, cyano phenyl group, aceto phenyl group, -OH group, chlorine, bromine or iodine.The structural unit (b) contains group of formula (5 and/or 6).A,R,X = same as defined above;s = 1-4;t = 4-s;u = 1-3;v = 3-u;x = 1-5; andy = 6-x.Neither of two t is 0, and neither of two v is 0. Structural unit (c) has structure of formula (7 and/or 8).A = same as defined above; andB-G = H, 1-6C aliphatic group, phenyl, nitro, cyano, 1-6C alkoxy, chlorine, bromine or iodine.At least two of B-E, are hydrogen. The proton acid groups of structural unit (b) are sulfonic acid group and/or phosphoric acid group. EXAMPLE - 6,6'-oxy-bis(2-(4-fluorophenyl)-4-phenyl quinoline) and N-methyl pyrrolidone were mixed in a flask. Subsequently, toluene (20 ml) was added to the flask and heated at 160 degrees C. The temperature was increased to 180 degrees C for 72 hours. The reaction mixture was poured into water (250 ml), and a polyelectrolyte compound (A) having structural units (a-c) was obtained. The content of structural unit (a) in the polyelectrolyte compound was 16.67 mol%. The content of structural unit (b) in the polyelectrolyte compound was 33.33 mol%. The content of structural unit (c) in the polyelectrolyte compound was 50 mol%. The polyelectrolyte compound (A) (1.5 g) was dissolved in N-methyl pyrrolidone (3.5 g). The resulting mixture was flow-spread on a glass plate. Subsequently, solvent was distilled-off. The plate was heated at 150 degrees C for 3 hours, and a film with thickness of 50 micrometers was obtained. The film was washed with distilled water, impregnated with 10% sulfuric acid aqueous solution for 5 hours, dried at 160 degrees C for 1 hour, and polymeric electrolyte film was obtained. The polymeric electrolyte film had excellent proton electric conductivity, water-resisting property, methanol-proof property, heat-resisting property and workability.