NOVELTY - Preparation of thiophene-furan heteroaromatic compound (I) comprises reacting thiophene compound (A) and furan compound (B) in an inert solvent in the presence of palladium salt as catalyst and an oxidizing agent.    USE - Preparation of compound (I) (claimed) used e.g. for photoelectric material, luminescent material, and solar battery.    ADVANTAGE - The method has high yield, simple and easy to obtain raw materials, small amount of catalyst, simple operation, and high reaction efficiency.    DETAILED DESCRIPTION - Preparation of thiophene-furan heteroaromatic compound of formula (I) comprises reacting thiophene compound of formula (A) and furan compound of formula (B) in an inert solvent in the presence of palladium salt as catalyst and an oxidizing agent.    R1-R3, R'1-R'3=H, cyano, halo, 1-10C alkyl, halogenated 1-10C alkyl, 2-10C alkenyl, halogenated 2-10C alkenyl, 2-10C alkynyl, phenyl substituted by halo or 2-10C alkynyl, 1-10C alkoxy, halogenated 1-10C alkoxy, -(CO)NR6R7, -(CO)O1-10C alkyl, 1-10C alkyl-carbonyl, formyl, phenyl optionally substituted by i, thiophene optionally substituted by i, furan optionally substituted by i, or -C=C-(CO)O1-10C alkyl;    i=halo, 1-6C alkyl, 1-6C alkoxy, -(CO)NR6R7, -(CO)O1-10C alkyl, 1-10C alkyl-carbonyl, or formyl;or    R1R2, R2R3, R'1R'2, R'2R'3=form a benzo or R4-substituted benzene;    R4=H, cyano, halo, 1-10C alkyl, halogenated 1-10C alkyl, 2-10C alkenyl, halogenated 2-10C alkenyl, 2-10C alkynyl, halogenated 2-10C alkynyl, 1-10C alkoxy, halogenated 1-10C alkoxy, -(CO)NR6R7, -(CO)O1-10C alkyl, 1-10C alkyl-carbonyl, formyl, phenyl optionally substituted by halo, 1-6C alkyl, 1-6C alkoxy, -(CO)NR6R7, -(CO)O1-10C alkyl, 1-10C alkyl, and/or carbonyl acyl, or -C=C-(CO)O1-10C alkyl;    X, Y'=S, O, or NR5;    R5=H, cyano, halo, 1-10C alkyl, halogenated 1-10C alkyl, 2-10C alkenyl, halogenated 2-10C alkenyl, 2-10C alkynyl, halogenated 2-10C alkynyl, -(CO)O1-10C alkyl, 1-10C alkyl-carbonyl, phenyl optionally substituted by halo, 1-6C alkyl, 1-6C alkoxy, -(CO)NR6R7, -(CO)O1-10C alkyl, 1-10C alkyl-carbonyl, and/or methyl, -C=C-(CO)O1-10C alkyl, or benzyl; and    R6, R7=H or 1-6C alkyl.