TiO2　films　on　Al　alloy　(Al),　anodic　aluminum　oxide　(AAO/Al,　formed　at　the　surface　of　At　alloy),　indium-tin　oxide　glass　(ITO/glass)　and　glass　were　prepared　by　a　dip　coating　method.　The　measurement　of　water　drop　contact　angle　under　UV　irradiation　shows　that　TiO2　films　on　the　conducting　At　substrate　have　a　higher　activity　for　photoinduced　hydrophilicity　than　that　on　the　non-conducting　AAO/Al　substrate.　Alternatively,　TiO2　films　on　the　conducting　ITO/glass　substrate　have　a　lower　activity　for　photoinduced　hydrophilicity　compared　to　TiO2　films　on　the　non-conducting　substrate　glass.　These　observations　are　due　to　electron　transfer　between　TiO2　and　substrates.　At　acts　as　an　electron　donor　and　donates　electrons　to　TiO2　which　results　in　an　increase　in　the　photoinduced　hydrophilicity　of　TiO2　film.　ITO　accepts　the　photogenerated　electrons,　which　results　in　a　decrease　in　the　photoinduced　hydrophilicity　of　TiO2　films.