TiO2-MoO3　composite　nanotube　thin　films　were　obtained　by　the　thermal　treatment　of　titanium　dioxide　nanotube　thin　films　in　the　presence　of　MoO3.　Titanium　dioxide　nanotubes　(TiO2　NTs)　thin　films　were　prepared　by　the　anodic　oxidation　of　titanium　foil.　The　resultant　thin　films　were　characterized　by　X-ray　diffraction　(XRD),　scanning　electron　microscopy　(SEM),　X-ray　photoelectron　spectroscopy　(XPS),　electrochemical　impedance　spectroscopy　(EIS),　Mott-Schottky　analysis,　and　photoelectrochemical　methods.　The　XRD　patterns　showed　that　an　anatase　type　TiO2was　present　in　the　thin　films.　Nanotube　structures　for　the　thin　films　were　observed　by　SEM.　MoO3　was　dispersed　on　the　TiO2　NT　top　surface.　Elemental　analysis　by　XPS　showed　that　MoO3　recombined　with　the　TiO2　NTs　to　form　TiO2-MoO3　composite　nanotube　thin　films.　The　influence　of　time　and　temperature　of　thermal　treatment　on　the　photoelectrochemical　response　for　the　TiO2-MoO3　composite　nanotube　thin　film　electrodes　were　investigated.　The　photoelectrochemical　response　of　the　TiO2-MoO3　composite　nanotube　thin　film　increased　under　visible　light　illumination　compared　with　the　pristine　TiO2　NTs.　The　highest　photoelectrochemical　response　was　observed　for　the　TiO2-MoO3　composite　nanotube　thin　film　obtained　by　thermal　treatment　at　450　°C　for　60　min.　©　Editorial　office　of　Acta　Physico-Chimica　Sinica.