Conjugated　polymers　(CPs)　represent　a　promising　platform　for　photocatalytic　CO2　fixation　owing　to　their　suitable　band　structures　that　meet　the　requirements　of　the　reduction　potential　of　CO2　to　value-added　fuels.　However,　the　photocatalytic　performance　of　CPs　is　rather　restrained　by　the　low　charge　transfer　efficiency.　Herein,　we　rationally　designed　three　CPs　with　a　more　delocalized　electronic　transmission　channel　and　planar　molecular　structure,　which　are　regarded　to　evidently　reduce　the　exciton　binding　energy　(E-b)　and　accelerate　the　internal　charge　transfer　process.　Besides,　the　assembly　of　suitable　electron-output　＂tentacles＂　and　cocatalysts　on　the　surface　of　CPs　could　effectively　facilitate　interfacial　electron　delivery.　Accordingly,　the　optimal　P-2CN　exhibits　an　apparent　quantum　yield　of　4.6　%　at　420　nm　for　photocatalytic　CO2　to　CO.　Further　adjusting　the　amounts　of　cyano　groups　and　cocatalysts,　the　CO　selectivity　could　be　obtained　in　the　range　of　0-80.5　%.