Rapid　developments　in　personal　electronics　and　sensor　networks　have　raised　urgent　and　challenging　requirements　for　portable　and　sustainable　power　sources.　As　a　result,　fabrication　of　highly　durable　piezoelectric　energy　harvesters　with　high　power　density　has　become　a　priority.　In　this　work,　a　sensitive　flexible　piezoelectric　energy　harvester　(FPEH)　was　constructed　by　filling　a　poly(vinylidene　fluoride)　(PVDF)　polymer　matrix　with　oriented　BaTi2O5　nanorods　(BT2).　Synthesizing　the　BT2　nanorods　by　the　molten　salt　method　gave　them　a　strong　polarity　along　the　b-axis,　and　they　were　then　further　aligned　in　the　horizontal　direction　in　the　PVDF　matrix　by　hot　pressing,　which　helped　to　give　them　a　textured　structure　that　would　ensure　a　significant　increase　in　power　generation　in　the　cantilever　beam　mode.　Out　of　all　the　compositions,　5　vol%　BT2/PVDF　FPEH　exhibited　the　optimal　energy　harvesting　performance　with　a　high　power　density　of　27.4　mu　W/cm(3)　together　with　excellent　mechanical　properties　under　a　large　acceleration　of　10　g.　More　importantly,　the　FPEH　retained　its　performance　even　after　an　extended　period　of　cantilever　vibration　cycles　(similar　to　330,000).　Because　of　their　excellent　performance,　FPEHs　show　great　potential　for　harvesting　mechanical　energy　for　self-powered　systems　and　can　be　used　to　harvest　energy　from　rotating　wheels　to　charge　a　capacitor　and　instantly　power　up　various　sensors.