The　original　PVDF　membrane　containing　AIBN　was　prepared　because　that　the　AIBN　and　PVDF　can　be　all　dissolved　in　strong　polar　solvent.　In　facile　condition,　the　free　radical　generating　from　heating　the　AIBN　can　initiate　grafting　polymerization　of　zwitterionic　polymer　PSBMA　onto　PVDF　membrane.　The　chemical　composition　of　the　membrane　surface　was　characterized　by　attenuated　total　reflectance/Fourier　transform　infrared　spectroscopy　(FT-IR-ATR).　The　field　emitting　scanning　electronic　microscopy　was　conducted　to　observe　the　membrane　morphology.　The　hydrophilicity　of　PVDF　membranes　after　grafting　PSBMA　has　improved　significantly　from　the　contact　angle　results.　the　contact　angle　of　PVDF-g-PSBMA　membrane　was　declined　to　62°　with　the　grafted　yield　of　13.8%.　By　BSA　static　absorbed　experiment,　the　anti-fouling　properties　of　modified　membrane　have　enhanced　remarkable　compared　to　original　membrane.