Organic-inorganic　hybrid　silica　membranes　were　prepared　by　sol-gel　method　with　bridged　silsesquioxane[1,　2-bis(triethoxysilyl)　ethane,　BTESE]　and　phenyltriethoxysilane　(PTES)　as　precursors.　The　pore　structure　and　hydrophobic　property　of　the　hybrid　silica　membranes　were　characterized　by　N2　adsorption,　contact　angle　meter,　TG　and　FTIR.　The　hydrogen　permeation　and　separation　performance　was　also　investigated.　The　results　show　that　the　modified　hybrid　silica　membranes　possess　a　desirable　microporous　structure　with　a　pore　width　centered　at　0.4-0.6　nm.　Such　a　pore　structure　can　be　retained　after　aging　for　30　d　under　a　temperature　of　40°C　and　a　relative　humidity　of　70%-80%.　The　hybrid　silica　membranes　become　hydrophobic　after　modification,　with　a　water　contact　angle　of　(125±0.4)°　at　a　PTES/BTESE　molar　ratio　of　0.6.　The　transportation　of　hydrogen　in　the　hybrid　silica　membranes　complies　with　the　activated　diffusion　mechanism,　with　a　permeance　of　8.71×10-7mol·m-2　·Pa-1·s-1　and　a　H2/CO2　permselectivity　of　5.53.