Porous　photoelectrodes　show　high　efficiency　in　hydrogen　production　by　water　splitting.　However,　fabrication　of　porous　nanorods　is　usually　difficult.　Here,　we　report　a　simple　approach　to　fabricate　a　kind　of　novel　porous　rutile　titanium　dioxide　nanorod　array　by　an　advanced　ion　implantation　method　using　multiple-energy　helium　ion　implantation　and　subsequent　annealing.　The　porous　nanostructure　enhances　the　photoelectrochemical　performance　of　the　titanium　dioxide　nanorod　array　photoelectrodes　under　Uv-visible　light　illumination,　where　the　highest　photocurrent　density　was　relatively　about　10　times　higher　than　that　of　the　pristine　titanium　dioxide　nanorod　array.　The　formation　of　nanocavities　mainly　contributes　to　the　enhancement　of　the　photocurrent　density　by　trapping　holes　inside　to　separate　the　charge　carriers.　The　study　demonstrates　that　ion　implantation　could　be　an　effective　approach　to　develop　novel　porous　nanostructural　photoelectrodes　for　the　application　of　hydrogen　production.