Highly　ordered　TiO2　nanotube　arrays　have　been　fabricated　via　anodization　in　NH4HF2/glycol　electrolyte　at　30　V　for　2　h.　The　obtained　TiO2　nanotube　array　is　amorphous　and　can　be　transferred　into　anatase　by　hydrothermal　or　solvothermal　annealing.　The　NaCl　aqueous　solution　and　ethanol　was　respectively　used　as　reaction　solution　during　the　hydrothermal　or　solvothermal　process.　It＇s　open　circuit　potential　(OCP)　in　3.5%　NaCl　aqueous　electrolyte　decreased　under　the　metal　halogen　light　irritation　and　increased　after　the　light　was　cut　off.　The　biggest　value　of　the　decrease　is　about　0.45　eV,　which　means　that　such　kind　of　thin　films　can　be　used　as　photo-induced　cathodic　protection　for　metals.