Based　on　the　strong　requirement　for　self-powered　devices,　energy　harvesting　by　utilizing　piezoelectric　materials　has　recently　attracted　extensive　attention.　Transduction　coefficient　(d(33)g(33))　is　the　core　parameter　of　the　piezoelectric　energy　harvesting　materials,　which　is　directly　determined　by　the　ratio　of　the　piezoelectric　charge　constant　(d(33))　to　the　dielectric　constant　(epsilon(r)).　Unfortunately,　traditional　solid　solution　design　method　generally　causes　a　simultaneous　increase　or　decrease　in　both　d(33)　and　epsilon(r),　making　it　difficult　to　obtain　a　high　d(33)g(33).　In　this　work,　a　composite　design　strategy　was　proposed　to　separate　the　synergistic　change　of　d(33)　and　epsilon(r).　This　was　achieved　by　introducing　lower-epsilon(r)　ZnAl2O4　secondary　phase　into　the　popular　0.2Pb(Zn1/3Nb2/3)O-3-0.8Pb(Zr1/2Ti1/2)O-3　(PZN-PZT)　perovskite　matrix.　Encouragingly,　the　epsilon(r)　value　rapidly　decreased,　while　d(33)　value　improved　within　a　certain　range　compared　to　those　of　pure　PZN-PZT.　This　was　ascribed　to　the　formation　of　fine　domain　structures　in　composites　caused　by　the　heterogeneous　interfacial　effect.　Subsequently,　the　cantilever　beam　type　piezoelectric　energy　harvesters　(PEHs)　made　from　the　optimal　composites　exhibited　a　high　power　density　of　4.0　W　mm(-3)　at　1　g　acceleration.　More　importantly,　PEHs　could　harvest　vibrational　energy　from　the　operating　motor　to　charge　a　capacitor　and　instantly　drive　wireless　micro-sensors,　demonstrating　their　potential　application　in　self-powered　electronics.　Under　the　guide　of　the　composite　design　strategy　proposed　in　this　work,　more　high　performance　piezoelectric　energy　harvesting　materials　can　be　built　in　the　future.