TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The bromating agent is N-bromo succimide, bromine, hydrogen bromide or phosphorus tribromide. The condensing agent is sodium hydride or sodium alkoxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of thienothiophene quinoid organic photoelectric material involves preparing 2-Bromo-thiophene compounds (II, III) and 3,6-Dimethyl-thieno(3,2-b)thiophene compound (IV). The 3,6-Dimethyl-thieno(3,2-b)thiophene compound and alkyl lithium are dissolved in first organic solvent. The obtained solution is added with trialkyl lithium chloride and stirred to obtain alkyl tin substituted 3,6-Dimethyl-thieno(3,2-b)thiophene compound (V). Stille coupling reaction is performed to the compounds (II, III) and the alkyl tin substituted compound (IV) in presence of a catalyst and second organic solvent. Bromating substitution is performed on a Stille coupling reaction product and a bromating agent to obtain a dibromo product, or bromating substitution is performed on the compound (IV) and the bromating agent to obtain the dibromo substituted thiophene compound of formula (VI). A condensing reaction is carried out between the dibromo product and malononitrile in presence of a catalyst, a condensing agent and a third organic solvent to obtain the thienothiophene quinoid organic photoelectric material. Preferred Processes: The alkyl tin substituted compound (IV) is generated by adding the 3,6-Dimethyl-thieno(3,2-b)thiophene compound (IV) and the alkyl lithium into the first organic solvent at -100 to -25 degrees C in a mol ratio of 1.0:2.0-1.0:4.0, stirring for 2-12 hours, adding trialkyl tin chloride of 2.0-4.0 times of the amount of the compound (IV) and stirring for 24-48 hours to obtain the alkyl tin substituted compound (V). The bromating substitution is performed by adding the Stille coupling reaction product or the compound (IV) and the bromating agent into fourth organic solvent, and reacting for 12-48 hours to obtain the dibromo-product. The condensation reaction is realized by mixing the dibromo-product and the malononitrile in a mol ratio of 1.0:2.0 to 1.0:10.0, and reacting for 12-72 hours with presence of the catalyst, the condensing agent and the third organic solvent at 75-120 degrees C to obtain the photoelectric material. The Stille coupling reaction is realized by performing Stille coupling reaction to the 2-Bromo-thiophene compounds (II, III) and the alkyl tin substituted compound (V) at 65-120 degrees C for 12-72 hours with presence of the catalyst and the second organic solvent to obtain the Stille coupling product. Preferred Components: The second organic solvent is glycol dimethyl ether, ethanol, methanol, methylene dichloride, methylene trichloride, tetrahydrofuran, ethyl acetate, benzene or methyl benzene. The third organic solvent is chosen from glycol dimethyl ether, ethanol, methanol, methylene dichloride, methylene trichloride, tetrahydrofura, ethyl acetate, dimethylformamide, methyl benzene or acetone. The fourth organic solvent is chosen from dimethylformamide, tetrahydrofuran, carbon tetrachloride, chloroform, methylene dichloride or acetonitrile. The catalyst is organic palladium catalyst or mixture of organic palladium and organic phosphine ligand. Preferred Properties: The mole ratio of the Stille coupling reaction product or the compound C to the bromating agent is 1.0:2.0-1.0:2.5. The organic palladium and organic phosphine ligand are mixed in a mol ratio of 1:2-20. The mol ratio of the compounds 2-Bromo-thiophene compounds (II, III) to the alkyl tin substituted compound (V) is 1.0:1.0:1.0 to 1.0:1.5:1.5. The mol ratio of the 2-Bromo-thiophene compounds (II, III) is 1:1.