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Three small bandgap non-fullerene(SBG NFAs)acceptors,BDTI,BDTI-2F and BDTI-4F,based on a carbon-oxygen bridged central core and thieno[3,4-b]thiophene linker,end-capped with varied electron-withdrawing terminal groups,were designed and synthesized.The acceptors exhibit strong absorption from 600 nm to 1000 nm.The optimal device incorporating designed NFA and PTB7-Th polymer donor achieves a power conversion efficiency of 9.11％with near 0 eV HOMO offset.The work presents a case study of efficient non-fullerene solar cells with small HOMO offsets,which is achieved by blending PTB7-Th with fine-tuned SBG acceptor.