Ag-TiO2　films　(Ag/Ti=3.3,　9.1　at-%)　were　sol-gel　coated　on　Ti-6Al-4V　alloy　that　had　been　surface　roughened　by　the　NaOH-HCl　treatment　for　antibacterial　applications.　Scanning　electron　microscopy　observation　showed　that　pore　size　of　the　surface　layer　of　NaOH-HCl　treated　Ti-6Al-　4V　alloy　increased　with　the　NaOH　concentration.　Ag-TiO2　films　on　the　surface　roughened　substrate　were　adherent　and　crack-free.　X-ray　photoelectron　spectroscopy　and　Auger　electron　spectroscopy　analyses　indicated　that　Ag　existed　in　metallic　state,　and　the　films　completely　covered　the　roughened　substrate.　X-ray　diffraction　peaks　of　the　substrate　and　anatase　TiO2　were　detected.　The　Ag-TiO2　films　on　the　roughened　substrate　exhibited　good　adhesion　quality　and　high　cohesion　strength　in　the　indentation　test.　The　potentiodynamic　polarisation　test　showed　that　the　TiO2　and　Ag-TiO2　films　improved　corrosion　resistance　of　the　substrate.