Central　to　the　design　and　execution　of　fouling-resistance　strategies　is　the　invention　of　hydrophilic　polymer　amenable　to　economically　viable　water　treatment.　Here,　an　ultrasonic-assisted　approach　enabled　the　hydrophilicity　created　by　grafting　acrylic　acid　(AA)　onto　the　polypropylene　hollow　fiber　membrane　(PPM).　It　is　worth　noting　that　the　graft　density　of　AA　on　PPM　surface　was　obviously　enhanced　due　to　the　effect　of　ultrasonic　cavitation.　When　the　graft　density　of　AA　is　up　to　0.82　mg/cm(2),　the　water　contact　angle　is　sharply　decreased　to　48.2　degrees　C.　However,　the　rejection　efficiency　of　PPM　to　Bovine　serum　albumin　(BSA)　and　the　pure　water　flux　(301.7　L/m(2)　h)　is　gradually　increased　with　the　improvement　of　graft　density,　which　comes　up　to　96%　and　186%,　respectively,　accompanied　with　largely　enhanced　water　flux　recovery　efficiency　(FRR)　exceeding　92%,　in　contrast　with　the　virgin　PPM.　It　is　great　of　interest　that　the　enhanced　surface　energy　for　PPM,　together　with　great　improvement　of　polar　component　over　1071%　and　15,595%,　respectively,　endowed　the　strong　interfacial　hydration　layer　on　the　surface　of　PPM,　resulting　in　the　high　water　flux,　excellent　rejection　efficiency　of　PPM　to　BSA　and　FRR　efficiency.