Designing　piezoceramics　with　a　large　transduction　coefficient　(d(33)　x　g(33))　is　key　to　improving　the　power　generation　of　piezoelectric　energy　harvesters　(PEHs).　However,　in　popular　PEH　materials　such　as　Pb(Zn1/3Nb2/3)O-3-Pb(Zr1/2Ti1/2)O-3　(PZN-PZT),　the　same　trend　in　the　variation　of　d(33)　and　epsilon(r)　makes　it　difficult　to　achieve　a　large　d(33)　x　g(33).　In　this　work,　we　introduced　low-epsilon(r)　Pb(In1/2Nb1/2)O-3　(PIN)　into　the　PZN-PZT　matrix　to　pull　down　the　epsilon(r)　of　the　quaternary　system.　This　simultaneously　stabilized　d(33)　in　a　certain　range　due　to　the　refinement　of　the　domain　structure　and　increased　the　electrostrictive　coefficient　(Q(33)),　and　consequently　the　d(33)　x　g(33)　value　increased　to　16081　x　10(-15)　m(2)/N　for　the　optimal　composition.　We　assembled　a　cantilever　beam　type　PEH　from　the　preferred　material　with　a　power　density　up　to　3.37　mu　W/mm(3)　at　1　g　acceleration,　and　demonstrated　its　use　to　charge　an　electrolytic　capacitor　to　drive　commercial　blue　LEDs　and　a　speed　sensor.