Developing　highly　efficient　photocatalysts　for　solar-fuels　production　under　visible-light　irradiation　is　of　great　promise,　but　still　remains　a　big　challenge.　In　this　work,　we　use　g-C3N4　incorporated　with　carbon　dots　as　the　photosensitizer　to　couple　with　tetra(4-carboxyphenyl)porphyrin　iron(III)　chloride　(FeTCPP)　molecular　catalyst.　The　obtained　g-C3N4-C-0.05/FeTCPP　hybrid　photocatalyst　exhibits　high　activity　for　the　solar-fuels　production　of　CO　and　H-2　under　visible-light　irradiation,　with　CO　yield　of　23.1　mmol/g　and　Hy　yield　of　71.1　mmol/g　in　6　h.　The　enhanced　mechanism　has　been　studied　by　various　techniques　like　photocurrent　response,　photoluminescence　and　mid-infrared　femtosecond　transient　absorption.　The　presence　of　trace　amount　of　carbon　dots　in　the　system　can　provide　an　alternative　channel　for　the　electron　transfer,　i.e.,　from　g-C3N4　to　FeTCPP　via　the　CDs.　Accordingly,　the　interfacial　charge　separation　and　electron　transfer　can　be　promoted,　leading　to　enhanced　photocatalytic　performance　of　the　g-C3N4-C-x/FeTCPP　hybrid　photocatalysts.