NOVELTY - Preparing 9,9-di(4-aminophenyl) fluorene, involves in three-mouth bottle, heating 9,9-dichlorofluorene and aniline at weight ratio of 1:4-6, under nitrogen protection with controlled heating speed at 60 degrees C for 30 minutes; then heating to 130 degrees C; performing insulating reaction for 7-10 hours; performing vacuum distillation; and dripping sodium hydroxide, adding toluene, heating, cooling and devitrifying, filtrating to obtain a grey solid, washing and drying to obtain 9,9-di(4-aminophenyl) fluorene crude product, recrystallizing the crude product to obtain 9,9-di(4-aminophenyl) fluorene.    USE - For preparing 9,9-di(4-aminophenyl) fluorine (claimed) used as a raw material for synthesizing polyfluorene, derivative electronic luminescent material and high-quality polyimide; and used as a raw material for an optical fiber, gas separation film, fuel cell proton transmission film, liquid crystal display, electroluminescent device, heat-resisting resin, engineering plastic.    ADVANTAGE - The method prepares product that has high yield and purity.    DETAILED DESCRIPTION - Preparing 9,9-di(4-aminophenyl) fluorene, involves adding 9,9-dichlorofluorene and aniline at weight ratio of 1:4-6 in 500 ml three-mouth bottle installed with a thermometer, a stirrer, an oil-water separator and a backflow condensing tube, charging nitrogen gas to protect, heating with controlled heating speed; heating to 60 degrees C in 30 minutes, then heating to 130 degrees C, performing an insulating reaction for 7- 10 hours, after the reaction is concluded, performing vacuum distillation to distil out superfluous aniline, then dripping sodium hydroxide solution to adjust pH to 10-13, after the dripping, adding toluene, heating to flow back until a black slurry exists in the system, cooling and devitrifying, filtrating to obtain a grey solid, washing the grey solid by cold toluene and n-hexane, vacuum-drying to obtain a 9,9-di(4-aminophenyl) fluorene crude product, recrystallizing the crude product by the mixed solvent of ethyl acetate and toluene in a weight ratio of 5-8:7-10, decoloring active carbon, heating to flow back, filtering with heat, and vacuum-drying to obtain high-purity white solid 9,9-di(4-aminophenyl) fluorene having melting point of 234-235 degrees C.