NOVELTY - A dry carbon nanotube and inorganic acid are mixed, heated, reacted, filtered and dried to obtain purified carbon nanotube. The resultant carbon nanotube, diamine, polyamine, organic solvent, acidulated carbon fiber, organic solvent and condensing agent are reacted, filtered and dried to obtain carbon fiber. The polytetrafluoroethylene and polyimide resin are mixed, stirred, compressed with functionalized carbon fiber reinforced component, formed and reacted to obtain polytetrafluoroethylene and functionalized carbon fiber modified polyimide resin composite material.    USE - Manufacture of polytetrafluoroethylene and functionalized carbon fiber modified polyimide resin composite material used for electronics, mechanical field, aircraft, aviation, wind-power generated electricity and transportation.    ADVANTAGE - The method provides polytetrafluoroethylene and functionalized carbon fiber modified polyimide resin composite material having excellent bonding strength, cohesiveness, stability and lubricity, by a simple process.    DETAILED DESCRIPTION - A dry carbon nanotube (0.1-1x 10 g) and inorganic acid (10-1x 104 ml) are mixed for 1-24 hours under ultrasonic wave (1-120 kHz) or centrifuging speed of 10-106 rpm, heated at 20-150 degrees C, reacted for 1-48 hours, diluted and washed using deionized water, filtered using microporous filtering membrane, further washed until the filtrate is neutralized and dried at 25-150 degrees C for 1-48 hours under vacuum atmosphere to obtain purified carbon nanotube. The obtained carbon nanotube (1-1x 102 g) and strong oxidizing acid (1-1x 104 ml) are reacted, processed for 0.1-12 hours under ultrasonic wave (1-120 kHz), heated at 25-120 degrees C, stirred, backflow-reacted for 0.2-12 hours, washed under deionized water, filtered using filter paper, washed until the filtrate is neutralized and dried at 25-150 degrees C for 1-48 hours under vacuum atmosphere to obtain acidulated carbon fiber. The obtained purified carbon nanotube (0.1-1x 10 g) is mixed with (1-1x 103 ml) strong oxidizing acid, processed for 0.1-80 hours under ultrasonic wave (1 to 120 kHz), diluted and washed using deionized water, filtered using microporous filter membrane, further washed until filtrate is neutralized and dried at 25-200 degrees C for 1-48 hours under vacuum atmosphere to obtain acidulated carbon nanotube. The obtained acidulated carbon nanotube (0.1-1x 10 g), diamine or polyamine (1-1x 103 g), organic solvent (1-1x 103 ml) and condensing agent (0.1-1x 10 g) are processed for 0.1-96 hours under ultrasonic wave (1-120 kHz), reacted at 25-220 degrees C for 1-96 hours, filtered and washed and dried at 25-250 degrees C for 1-48 hours under vacuum atmosphere to obtain ammoniated carbon nanotube. The obtained ammoniated carbon nanotube (0.1-1x 10 g), acidulated carbon fiber (1-1x 102 g), organic solvent (1-1x 103 ml), condensing agent (0.1-1x 10 g) are processed for 0.1-12 hours under ultrasonic wave (1-120 kHz), reacted at 25-220 degrees C for 0.1-96 hours, added with diamine or polyamine and condensing agent (0-1x 10 g), reacted for 1-96 hours, filtered, washed and dried at 25-200 degrees C for 1-48 hours under vacuum atmosphere to obtain the carbon fiber. The surface of obtained carbon fiber is grafted with amino and carbon nanotube. The polytetrafluoroethylene (0.1-1x 10g) and polyimide resin (1-1x 103 g) are mixed, stirred, compressed with functionalized carbon fiber reinforced component (1-1x 102 g) through a vacuum mould, defoamed and formed and reacted at 50-400 degrees C for 0.5-48 hours to obtain polytetrafluoroethylene and functionalized carbon fiber modified polyimide resin composite material.