Hydrophilic　modification　of　high-density　polyethylene　membrane　was　performed　with　the　introduction　of　peroxide　onto　the　membrane　surface　by　corona　discharge　treatment,　followed　by　graft　polymerization　with　acrylic　acid.　The　surface　graft　polymerization　was　confirmed　by　attenuated　total　reflection-infrared　and　X-ray　photo　spectroscopy.　Surface　hydrophilicity　was　investigated　by　measuring　the　contact　angles　and　moisture　adsorption　of　the　modified　membrane.　The　results　indicated　that　the　modified　membrane　showed　a　significant　increase　in　hydrophilicity.　And　water　flux　of　the　film　increased　from　102　L/m(2)　h　of　the　virgin　film　to　200　L/m(2)　h　of　the　grafted　film,　while　the　bovine　serum　albumin　solution　flux　of　the　membrane　increased　from　43　L/m(2)　h　of　the　virgin　film　to　98　L/m(2)　h　of　the　modified　membrane.