In　this　paper　we　present　a　new　method　to　prepare　organic-inorganic　hybrid　PVDF/Si　membranes　by　adding　tetraethyl　orthosilicate　(TEOS)　into　the　polyvinylidene　fluoride　(PVDF)　casting　solution.　During　the　membrane　coagulation　in　acid　bath　(pH　=　1),　the　TEOS　was　hydrolyzed　and　polymerized,　and　silicon-oxygen　polymers　were　formed.　The　silicon-oxygen　polymers　may　entangle　or　interpenetrate　with　PVDF　chains,　which　is　beneficial　to　the　mechanical　performances　of　hybrid　membranes.　Element　analysis　showed　Si　existed　on　the　surface　and　bottom　of　hybrid　membrane　when　TEOS　was　added　to　the　casting　solution.　The　effects　of　TEOS　on　the　performances　of　hybrid　membranes　were　investigated.　The　results　showed　that　the　pure　water　flux　increased　firstly　and　then　decreased　and　the　BSA　retention　decreased　with　TEOS　content　increasing.　When　TEOS　content　was　about　12　wt.%,　the　pure　water　flux　of　hybrid　membrane　was　similar　to　that　of　PVDF　membrane　without　TEOS　addition,　but　the　tensile　strength　and　elastic　modulus　of　hybrid　membrane　was　almost　twice.