A novel fused-ring small molecule IDT-2T-IC with elongated conjugation length was synthesized and used as non-fullerene acceptor in polymer solar cells (PSCs). Thermal properties, light absorption properties and electrochemical properties were characterized. This material display wide-range absorption from 300 nm to 850 nm and strong aggregation tendency. After device optimization, bulk heterojunction (BHJ) PSCs based on IDT-2T-IC as electron acceptor and PTB7-Th as polymer donor show a power conversion efficiency (PCE) of 2.17%.