The　utilization　of　solar　energy　for　CO2　reduction　reaction　(CO2RR)　into　valuable　hydrocarbons　offers　attractive　solution　towards　low-carbon　future,　but　their　performance　is　affected　by　the　competing　hydrogen　evolution　reaction　(HER)　that　occurs　simultaneously.　Herein,　we　proposed　maximizing　interface　integration　and　surface　reconstructing　engineer　strategy　to　improve　the　CO2RR　activity　and　selectivity　of　heterojunction　photocatalyst.　A　surface-reconstructed　ZnO/CuOx　catalysts　are　uniformly　anchored　on　the　porous　carbon　nanosheet　arrays　that　are　supported　by　carbon　nanofibers　(ZnO/CuOx-C　CNFs).　Downsizing　ZnO/CuOx　maximizes　the　interface　integration　of　components　to　promote　electron-hole　pairs　separation　and　increase　surface　active　site　density.　Moreover,　the　surface　reconstruction　(the　formation　of　the　hydroxyl　groups　on　ZnO　via　facile　light　irradiation)　promotes　the　kinetic　of　CO2RR　to　CH4　and　oxygen　evolution　reaction　(OER),　while　depressing　the　competing　HER　and　CO　generation.　All　these　advantages　contribute　to　the　excellent　catalytic　performance:　a　high　CH4　generation　rate　of　241.6　mu　mol　h(-1)　g(-1)　with　the　selectivity　of　similar　to　96　%　for　ZnO/CuOx-C　CNFs　under　full　light　irradiation.　The　insight　into　the　modification　of　photocatalyst　structure　and　mechanism　investigation　pave　the　way　for　a　new　design　strategy　to　advance　solar　photocatalytic　technology　for　CO2　reduction.