NOVELTY - A naphthalene tetracarboxylic acid diimide organic semiconductor material comprises di thiophene amino substituted compound (I).    USE - Naphthalene tetracarboxylic acid diimide organic semiconductor material for use in polymer solar battery, organic electroluminescent, organic field effect transistor, organic optical storage, organic non-linear material and organic laser field (all claimed).    ADVANTAGE - The semiconductor material is polymerized from the dithienylpyrrole unit and the naphthalenetetracarboxylic acid diimide unit so as to increase carrier mobility of the organic semiconductor material, increase spectral response, ensures better carrier transmission properties and electrochemical reduction properties and improves solubility through introducing an alkyl chain with simple process. The preparation process of the organic semiconductor material is simple and easy to operate and control. The semiconductor material is suitable for industrial production.    DETAILED DESCRIPTION - A naphthalene tetracarboxylic acid diimide organic semiconductor material comprises di thiophene amino substituted compound of formula (I).    R1=1-20C alkyl group;    R2=1-20C alkyl group, phenyl, 1-20C alkyl group or 1-20C mono-substituted or multisubstituted phenyl;    x+y=2;    x=1-2;    y=0-1;and    n=1-100.    An INDEPENDENT CLAIM is also included for a method for preparing naphthalene tetracarboxylic acid diimide organic semiconductor material, which involves reacting 2,6-bis-trimethyl tin-N-alkyl thiophene thiophene (3,2-b: 2', 3'-d) pyrrole compound of formula (II), 2,6-dibromo-N-alkyl thiophene (3,2-b: 2', 3'-d) pyrrole compound of formula (III) and N, N'-bis-substituted 2,6-dibromo-1,4,5,8-naphthalene tetracarboxylic acid imide compound of formula (IV) at 60-132 degrees C under presence of catalyst and organic solvent A according to a mol ratio of m: p: q and reacting obtained product with stille coupling reaction at 24-72 degrees C to obtain the naphthalene tetracarboxylic acid diimide organic semiconductor material.