Surface　modification　of　titanium　dioxide　(TiO2)　with　silver　and　bismuth　was　performed　to　increase　the　photocatalytic　degradation　of　methylene　blue　(MB).　The　effect　of　initial　calcination　temperature,　reaction　time,　catalyst　loading　and　initial　pH　value　was　studied.　The　physicochemical　properties　of　as-prepared　samples　were　characterized　by　XRD,　UV-Vis　DRS,　TG-DTG　and　XPS.　The　results　indicate　that　Ag-Bi-TiO2　has　more　excellent　visible　light　photocatalytic　activity　in　degradation　of　MB　than　that　of　pure　TiO2　photocatalyst.　The　optimum　synthesis　condition　is　justified　at　the　Ag/Bi　ratio　as　1,　the　calcined　temperature　as　350　°C,　the　catalyst　amount　as　1.25　g/L　and　the　pH　value　of　solution　as　5.98.　Decolourizing　rate　of　solution　rises　to　95　%　within　5　h　and　the　mineralization　ratio　of　24　h　to　85.1　%.　The　codoped　metals　exist　in　manifold　oxide　forms　in　Ag-Bi-TiO2　sample.　Namely,　they　can　extend　the　photoresponsiveness　into　the　visible　light　region,　thus　showing　the　potential　applications　for　the　degradation　of　organic　pollutants.　©　The　Nonferrous　Metals　Society　of　China　and　Springer-Verlag　Berlin　Heidelberg　2011.