The　highly　ordered　aligned　titania　nanotubes　thin　films　were　successfully　prepared　by　liquid　phase　deposition　(LPD)　method.　Anodic　aluminium　oxide　(AAO)　used　as　starting　material　was　immersed　in　an　aqueous　ammonium　hexafluorotitanate　((NH4)(2)TiF6)　solution.　The　results　show　that　anatase　titania　can　be　obtained　after　the　thin　films　are　annealed　at　400　degrees　C　for　4h.　The　outside　diameter　of　the　titania　nanotube　is　about　150nm　and　the　wall　thickness　of　the　nanotubes　is　approximately　25nm.　Moreover,　the　thickness　of　titania　nanotube　array　is　about　5　mu　m.　The　annealed　TiO2　thin　films　have　good　photocatalytic　activity　on　the　degradation　of　methyl　blue,　i.e.,　methyl　blue　can　be　entirely　degradated　after　120nm　mercurry　are　irradiation.