TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The alkali solution is selected from one of sodium hydroxide water solution, sodium carbonate water solution, sodium bicarbonate water solution and tetraethyl ammonium hydroxide aqueous solution.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The catalyst is mixture of organic palladium or inorganic palladium and organic phosphorus ligand, where the inorganic palladium is selected from one of tetrakis(triphenylphosphine)palladium, tris(dibenzylideneacetone)dipalladium and tetrakis(triphenylphosphine)palladium chloride, and the organic phosphorus ligand is tri(o-tolyl)phosphine. The primary organic solvent is selected from one of toluene, tetrahydrofuran, chloroform and ethyl acetate. Preferred Process: The 2,7-bis (4,4,5,5-dimethyl-1,3,2-di-oxygen amyl boron alkyl) 9, 9 - dialkyl fluorene of formula (B1) is prepared by reacting 2, 7-9, 9-dialkyl fluorine of formula (A1) and n-butyl lithium at -100-25 degrees C in an oxygen free environment with secondary organic solvent, where mol ratio of the 2,7-9, 9-dialkyl fluorine to the n-butyl lithium to the secondary organic solvent is 1.0: 1.0-2.0: 4.0. The 2, 4, 5, 5-tetramethyl-1, 3, 2-dioxygen heterocyclic butyl borane is added, and recovering continuous reaction is carried out for 48 hours at room temperature to obtain 2,7-bis (4,4,5,5-dimethyl-1,3,2-di-oxygen amyl boron alkyl) 9, 9 - dialkyl fluorene of formula (B1), where the secondary organic solvent is selected from one of tetrahydrofuran, aether, dichloromethane, trichloromethane and ethyl acetate, and molar weight of 24, 4, 5, 5-tetramethyl-1, 3, 2-dioxygen heterocyclic butyl borane is 2.0-4.0 times of the 2,7-bis (4,4,5,5-dimethyl-1,3,2-di-oxygen amyl boron alkyl) 9, 9 - dialkyl fluorine. The 5-alkyl thiophene (3,4-c)-pyrrole -4,6- dibromo product of formula (B1) is prepared by reacting 5 -alkyl thiophene (3,4-c) - pyrrole-4 ,6 - dione of formula (A2) and N-bromosuccinimide in oxygen free environment at 0-30 degrees C under action of third organic solvent for 12-48 hours to obtain dibromo product of formula (B1), where molar ratio of 5 -alkyl thiophene (3,4-c) - pyrrole-4 ,6 - dione, N-bromosuccinimide and third organic solvent is 1.0: 1.0-2.0: 4.0, and the third organic solvent is mixed solvent of sulfuric acid and trifluoroacetic acid. Preferred Composition: The dosage of the catalyst in the 2,7-bis (4,4,5,5-dimethyl-1,3,2 - two miscellaneous oxygen amyl boron alkyl) 9, 9 - dialkyl fluorene is 0.005-0.01 times of dosage of alkali solution in 5-alkyl thiophene (3,4-c)-pyrrole -4,6- dibromo product, which is 2-20 times of the 2,7-bis (4,4,5,5-dimethyl-1,3,2 - two miscellaneous oxygen amyl boron alkyl) 9, 9 - dialkyl fluorene.