Strong　excitonic　effects　are　common　in　organic　conjugated　polymer　semiconductors,　severely　hindering　the　generation　of　free　charge　carriers　for　conducting　photocatalysis.　Therefore,　exploring　new　channels　to　modulate　exciton　dissociation　in　polymers　is　far-reaching　in　facilitating　photocatalysis.　A　series　of　B-N　Lewis　pair　functionalized　conjugated　polymers　have　been　developed　to　minimize　exciton　effects　by　modulating　charge　transfer　pathways.　Theoretical　studies　have　shown　that　introducing　B-N　Lewis　pairs　can　dramatically　increase　the　distance　of　charge　transfer　(D　index)　and　the　amount　of　electron　transfer　and　reduce　the　Coulomb　attraction　energy　(EC),　which　contributes　to　breaking　the　equilibrium　of　the　coexistence　of　excitons　and　charge　carriers.　Further　experimental　results　show　that　the　singlet　excitons　are　efficiently　dissociated　into　more　free-charge　carriers　under　photoexcitation　to　participate　in　surface　reactions.　The　optimized　polymer　PyPBM　shows　an　exponential　increase　in　photocatalytic　hydrogen　and　hydrogen　peroxide　production　performance　by　visible　light　illumination.