TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The carbon nanotube is single-wall carbon nanotubes or multi-wall carbon nanotubes manufactured by chemical vaporous deposition method, arc discharged method, solar energy method, template method or laser evaporation method. The inorganic acid contains (in weight%) nitric acid (1-35), sulfuric acid (1-55) or hydrochloric acid (1-50). The oxidizing acid comprises nitric acid (0.1-70), sulfuric acid (1-100), mixed solution of potassium permanganate and sulfuric acid in the molar ratio of 1/100-100/1, mixed solution of nitric acid and sulfuric acid in the molar ratio of 1/100-100/1, mixed solution of potassium permanganate and nitric acid in the molar ratio of 1/100-100/1, mixed solution of hydrogen peroxide and sulfuric acid in the molar ratio of 1/100-100/1, mixed solution of hydrogen peroxide and hydrochloric acid in the molar ratio of 1/100-100/1 and/or mixed solution of hydrogen peroxide and nitric acid in the molar ratio of 1/100-100/1.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The diamine is ethylene diamine, polyethylene diamine, 1,2-propanediamine, 1,3-propanediamine, 1,2-butanediamine, 1,3-butanediamine, 1,6-hexamethylenediamine, p-phenylenediamine, cyclohexanediamine, metaphenylene, phenyldimethylamine, diaminodiphenyl-methane, menthanediamine hexamethylenediamine chloride, nonyldiamine chloride, decamethylenediamine chloride, dodecamethylenediamine and/or tridecanoic diamine. The polyamine is triethylamine, butanetriamine, N-aminoethyl piperazine, dicyandiamide, dihydrazine adipate, N,N-dimethyl dipropylenetriamine, pentamethyl-diethylenetriamine, N,N,N,N,N-pentamethyl-diethylene triamine, tetraethylene pentamine, diethylenetriamine, triethylene tetramine, pentaethylene hexamine and/or hexaethylene heptamine. The organic solvent is benzene, toluene, xylene, styrene, butyltoluene, perchloroethylene, trichloroethylene, vinyltoluene, ethylene glycol monovinyl ether, dichloromethane, carbon dioxide, triorthocresol phosphate, methanol, ethanol, isopropyl alcohol, cyclohexane, cyclohexanone, toluene cyclohexanone, diethyl ether, propylene epoxide, acetone, methyl butyl ketone, methyl isobutyl ketone, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, acetonitrile, pyridine, chlorobenzene, dichlorobenzene, dichloromethane, trichloromethane, carbon tetrachloride, trichloroethylene, tetrachloroethylene, trichloropropane, dichloroethane, N,N-dimethylformamide, dimethyl sulfoxide, dioxane and/or tetrahydrofuran. The condensing agent is N,N'-dicyclohexyl carbodiimide, N,N'-diisopropyl carbodiimide and/or 1-ethyl-3-dimethylamine propyl carbodiimide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The carbon fiber is long fiber, fiber cloth or short fiber. The polyimide is thermoplastic polyimide or thermosetting polyimide.