The　utilization　of　relaxor-based　ferroelectrics　with　high　piezoelectricity　is　considered　to　be　an　effective　way　to　enhance　the　power　generation　capacity　of　piezoelectric　energy　harvesters　(PEHs).　However,　the　severe　depolarization　behavior　in　the　high-temperature　region　is　the　main　issue　that　hinders　the　application　of　relaxor-based　ferroelectrics　in　high-temperature　PEHs.　Here,　the　goal　of　obtaining　a　high　piezoelectric　charge　coefficient　(d(33))　together　with　excellent　temperature　stability　in　relaxor-based　ferroelectrics　is　achieved　through　a　lattice　distortion　design　strategy　combined　with　domain　configuration　matching.　Based　on　this　concept,　a　new　relaxor-based　ferroelectric　xPb(Zn1/3Nb2/3)O-3-(1　-　x)Pb(HfyTi(1-y))O-3　(xPZN-(1　-　x)PHyT(1-y))　is　investigated　and　the　corresponding　high-temperature　PEHs　are　fabricated.　A　high　Curie　temperature　of　319　degrees　C　and　a　large　d(33)　of　540　pC　N-1　are　achieved　at　the　optimal　composition　(x/y　=　0.075/0.49)　simultaneously,　which　are　superior　to　those　of　the　existing　commercial　PZT-based　piezoceramics.　The　enhanced　lattice　angle　distortion　(|beta-90　degrees|)　with　a　hierarchical　domain　configuration　balances　the　piezoelectricity　and　thermal　stability　in　relaxor-based　ferroelectrics.　Furthermore,　the　newly　developed　PZN-PHT　PEH　exhibits　a　stable　output　current　over　a　broad　temperature　range　(25-275　degrees　C)　and　satisfactory　cycling　reliability　(up　to　200　000　cycles　without　degradation)　at　250　degrees　C.　These　characteristics　demonstrate　that　the　PZN-PHT　relaxor-based　ferroelectric　is　a　promising　candidate　for　high-temperature　PEH　applications.