TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The alkali is aqueous solution of sodium carbonate (Na2CO3). The polymerization is featured by adding catalyst which is organic palladium catalyst or a mixture of organic palladium catalyst with organic phosphine ligand. The concentration of the catalyst is 0.5-15% of the molar percentage of oxaborolane anthracene compound. The organic palladium catalyst is tris(dibenzylideneacetone)dipalladium(0), tetrakis(triphenylphosphine)palladium or bis(triphenylphosphine)palladium chloride; and the molar ratio of organic palladium catalyst to organic phosphine ligand is 1: 2-20. The oxygen-free condition is the environment filled with inert gas.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Compound (I) is prepared by processing polymerization of oxaborolane anthracene compound with bromothiophene compound under an oxygen-free condition and a weak alkali condition to obtain the target copolymer. Preferred Method: The polymerization temperature is 60-95 degrees C and the polymerization time is 24-72 hours. Preferred Components: The alkali under the weak alkali condition is metal hydroxide, metal carbonate or tetraethyl ammonium hydroxide, and the concentration is 5-10 times of the molar ratio of oxaborolane anthracene compound of formula (A). The reaction solvent for polymerization is toluene, tetrahydrofuran, glycol dimethyl ether, benzene or N,N-dimethyl formamide. The bromothiophene compound is of formula Br-Ar'-Br (B). The structure with thiophene unit is one or more of 7 compounds, e.g. compounds of formula (C) and (D).R3, R4=mono-substituted or multi-substituted functional groups which can be H, cyano, 1-40C alkyl, 1-40C alkoxy, 6-40C aromatic groups or 6-40C aryl alkoxy groups. Preferred Definitions:    R1, R2=linear, branched or annular alkyl groups, optionally substituted aromatic groups or heteroaryl groups; or non-adjacent methylene groups, arylidene groups and/or hetero arylidene groups in the alkyl groups, where aromatic groups or heteroaryl groups are mutually independently connected by -O-, -S-, -NH-, -CO-, -COO-, -OCO-, -OCO-O-, -SCO-, -CH=CH- or -C=C-.