Synthesis and photovoltaic properties of two donor-acceptor polymers containing benzodithiophene with 3,3',5-trihexylbithienyl substituents are reported. Benzo[c]-[1,2,5]thiadiazole and 5-hexylthieno[3,4-c]pyrrole-4,6-dione were used as acceptor building blocks for the synthesis of donor-acceptor polymers. The photovoltaic properties of the synthesized donor-acceptor polymers were investigated in bulk heterojunction solar cells with [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) acceptor.