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In order to increase the power conversion efficiency(PCE)of non-fullerene polymer solar cells(PSCs),the absorption spectra of donor and acceptor should be complementary for efficient light harvesting.Here,we designed and synthesized two types of medium bandgap polymers in which two dimension-conjugated benzodithiophene(BDT)(BDTT and BDTPS)was used as the electron donating units and tetrafluoroquinoxaline(ffQx)was used as electron accepting unit,namely PffQx-T and PffQx-PS,for the application as donor in the PSCs with a popular non-fullerene small molecule ITIC as acceptor.