TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The organic solvents (S1) and (S3) consist of tetrahydrofuran, ethylene glycol dimethyl ether, benzene and/or toluene. The organic solvent (S2) consists of quinoline, imidazole, butanol, N-methyl-2-pyrrolidone, or propanoic acid. The catalysts (X1) and (X2) consist of organic palladium or a mixture of organic palladium and organic phosphine ligand. The organic solvent (S4) consists of tetrahydrofuran, chloroform (CHCl3), 2,5-dimethylfuran, and/or o-dichlorobenzene. The alkyl lithium compound consists of n-butyllithium, tert-butyl lithium, methyl lithium, or phenyl lithium. The organic solvent (S5) consists of tetrahydrofuran, ether, and/or dioxane.    TECHNOLOGY FOCUS - POLYMERS - Preparation (claimed): Compound (I) is prepared by performing Stille coupling reaction on perylene tetracarboxylic diimide compound of formula (II) and thiofuran-containing amine compound of formula (III) in an organic solvent (S1) in the presence of catalyst (X1) to obtain the compound (I). Preferred Method: The compound (II) is prepared by performing condensation reaction on bromine-containing perylene tetracarboxylic dianhydride compound of formula (A) and amine compound of formula (B) in an organic solvent (S2) at 60-100 degrees C for 1-72 hours to obtain the compound (II). The mole ratio of compounds (A) and (B) is 1:(3-10). The compound (III) is prepared by (a) performing Stille coupling reaction on thiofuran-containing compounds of formulae (C) and (D) in an organic solvent (S3) in the presence of a catalyst (X2) at 60-110 degrees C for 72 hours to obtain a thiofuran-containing amine compound of formula (IIIa); (b) performing bromination reaction on compound (IIIa) using bromosuccinimide in an organic solvent (S4) at 20-120 degrees C to obtain a thiofuran-containing amine compound of formula (IIIb); and (c) reacting the compound (IIIb) and alkyl lithium compound in an organic solvent (S5) at - 50-(- 20) degrees C for 1-3 hours, adding with tributyl tin chloride (Sn(C4H9)3Cl) or methyl tin chloride (SnCH3Cl), reacting at - 50-(- 20) degrees C for 0.5-2 hours, heating to room temperature, and continuously reacting for 5-40 hours to obtain the compound (III). In step (a), the mole ratio of compounds (C) and (D) is 1:(2-2.5); and the catalyst is utilized at a dosage of 0.01-5 mole % (based on the total amount of compounds (C) and (D)). In step (b), the mole ratio of compound (IIIa) and bromosuccinimide is 1:(2-2.5). In step (c), the mole ratio of compound (IIIb), alkyl lithium compound and Sn(C4H9)3Cl or SnCH3Cl is 1:(1-2):(2-5). The Stille coupling reaction for compounds (II) and (III) is preferably performed at 50-120 degrees C for 72 hours in the organic solvent (S1) in the presence of catalyst (X1) to obtain the compound (I). The mole ratio of compounds (II) and (III) is (1-1.5):1. The catalyst (X1) is utilized at a dosage of 0.01-5 mole % (based on the total amount of compounds (II) and (III)). Preferred Definitions:    R1-R3=8-12C alkyl or 8-12C alkoxy phenyl; and    R4-R7=8-12C alkyl, 8-12C alkoxy or 8-12C alkoxy phenyl.