The　photocatalyst　gamma-Fe2O3/Ag/TiO2　with　highly　visible-light　response　was　synthesized　by　two-step　process.　The　photocatalytic　antibacterial　performance　under　visible　light　was　evaluated　by　the　lgReduction　on　the　E.　coli.　The　physical　and　chemical　properties　of　gamma-Fe2O3/Ag/TiO2　were　analyzed　by　means　of　X-ray　powder　diffraction　(XRD),　scanning　electron　microscopy　(SEM),　X-ray　photoelectron　spectroscopy　(XPS),　magnetic　property　measurement　system(MPMS)　and　other　characterization　methods.　The　results　indicate　that　the　catalyst　has　mesoporous　structure　with　a　specific　surface　area　of　89.　1　m(2)/g　and　its　absorption　boundary　reaches　690　nm.　The　catalyst　exhibited　excellent　visible　light　response,　remarkable　antibacterial　properties　and　strong　magnetic　properties　,　which　can　be　effectively　separated　and　reused　in　the　water　treatment.　The　optimal　preparation　parameters　,　such　as　the　calcination　temperature　,　the　calcination　time　and　n　(Ti)/n　(Ag)　were　determined　as　350　degrees　C　,　3　h　and　1　:　0.　05,　respectively.