In　the　present　paper,　ordered　mesoporous　silica　(KIT-6)　as　support,　nanosized　TiO2　into　KIT-6　was　synthesized　by　titanium　tetraisopropoxide　hydrolysis.　Then　silver　was　loaded　by　deposition-precipitation　method.　Ag-TiO2/KIT-6　composite　nanosized　photocatalyst　was　firstly　synthesized　and　a　series　of　correlated　catalysts　were　synthesized　by　the　same　preparation　method.　Methyl　orange　is　presently　adopted　as　a　representative　organic　pollutant　to　evaluate　the　photocatalytic　performance　of　the　as-synthesized　catalysts.　The　order　of　photocatalytic　activity　of　the　as-synthesized　samples　was　found　as　Ag-TiO2/KIT-6　＞　Ag/TiO2　＞　TiO2/KIT-6　＞　TiO2　＞　Ag/KIT-6.　Detailed　characterizations　were　conducted　by　techniques　including　XRD,　N2　physical　adsorption,　XPS,　UV-Vis　DRS　and　TEM.　It　was　found　that　the　Ag-TiO2/KIT-6　sample　shows　the　highest　photocatalytic　activity,　which　should　be　attributed　to　the　Ag-TiO2　heterojunction　structure　and　higher　BET　surface　area　of　the　Ag-TiO2/KIT-6　sample.　Ag-TiO2　heterojunction　improves　the　separation　of　photogenerated　electron-hole　pairs,　thus　enhancing　the　photocatalytic　activity;　Ag-TiO2/KIT-6　sample　possesses　high　BET　surface　area,　which　facilitates　adsorption　and　transportation　of　dye　molecules,　also　leading　to　higher　photocatalytic　activity.