NOVELTY - An organic semiconductor material comprises fluorene compound (I) containing anthracene and thieno-thiophene units.    USE - Organic semiconductor material for producing an organic solar battery device, organic FET, organic electroluminescent device, organic light storage device, organic nonlinear material and an organic laser device (claimed).    ADVANTAGE - The material has better photo-thermal stability, better film-forming property and high photoelectric conversion efficiency. The material can be prepared in a simple manner.    DETAILED DESCRIPTION - An organic semiconductor material comprises fluorene compound of formula (I) containing anthracene and thieno-thiophene units.    R1,R2=H, F, 1-40C alkyl, 1-40C aryl or 1-40C heteroaryl;    R3,R4=H, F, 1-40C alkyl, 1-40C alkoxy, 6-40C alkyl, 6-40C aryl or 6-40C alkoxy;    n=1-200;    m=1-20;    x,y=positive real numbers;and    x+y=1.    An INDEPENDENT CLAIM is also included for an organic semiconductor material preparing method, which involves adding 2,7-dibromo-9,9 dialkyl fluorene and n-butyl lithium into solvent in absence of water and oxygen at -70 to -85 degrees C, adding 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2 dioxa pentaborane or bis-pinacol and diboride, reacting for 12-48 hours for obtaining 2,7-di (4,4,5,5-tetramethyl-1,3,2-dioxa pentaborane) 9,9-dialkyl fluorene compound of formula (II), adding the compound (II) with 9,10-dibromo anthracene compound of formula (III) in absence of oxygen, adding thieno (3,2-b) thiophene compound of formula (IV), catalyst and aqueous solution of alkali into solvent, and performing suzuki reaction for 12-72 h at 60-100 degrees C for obtaining organic semiconductor material.    R1,R2=H, F, 1-40C alkyl, 1-40C aryl or 1-40C heteroaryl;and    R3,R4=H, F, 1-40C alkyl, 1-40C alkoxy, 6-40C aryl, 6-40C alkyl or 6-40C aryl alkoxy.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic illustration of a method for preparing an organic semiconductor material. '(Drawing includes non-English language text)'