Improving　the　power　generation　characteristics　of　piezoelectric　energy　harvesters　requires　the　construction　of　piezoelectric　ceramics　with　high　transduction　coefficient　(d(33)　x　g(33)),　which　remains　a　big　challenge.　In　this　paper,　guided　by　piezoelectric　energy　harvester　applications,　the　relationship　between　the　composition,　microstructure　and　transduction　coefficient　of　(1　-　x)BiScO3-xPbTiO(3)　material　is　systematically　studied.　The　results　demonstrated　that　the　sample　with　a　composition　of　x　=　0.64　not　only　has　a　high　Curie　temperature　(426　degrees　C)　which　is　beneficial　to　improve　the　working　stability　of　the　device,　but　also　has　a　very　high　d(33)　x　g(33)　value　(15,110　x　10(-15)　m(2)/N),　which　is　significantly　superior　to　the　commercial　PZT　system.　Excellent　electrical　performance　can　be　attributed　to　the　fact　that　the　composition　of　x　=　0.64　located　near　MPB　has　a　very　high　piezoelectric　charge　constant　(505　pC/N)　at　the　same　time　with　moderate　dielectric　constant　(1907).　The　cantilever-type　energy　harvester　made　of　optimized　composition　generated　a　high　output　power　density　of　2.93　mu　W/mm(3)　at　room　temperature,　which　charged　a　commercial　47　mu　F　electrolytic　capacitor　to　22　V　in　just　220　s　and　lighted　up　72　LEDs　for　0.1~0.2　s.　Further,　x　=　0.64　harvester　exhibited　a　large　output　voltage　of　2.76　V　even　at　350　degrees　C,　suggesting　its　potential　use　for　powering　high　temperature　wireless　sensors.