The　effects　of　Cr2O3　addition　on　the　microstructure　and　piezoelectric　properties　of　0.2Pb(Zn1/3　Nb2/3)O3-　Pb　(Ti0.5Zr0.5)O3(PZN-PZT)　ceramics　were　investigated.　When　the　concentration　of　Cr2O3　is　below　0.3wt%,　Cr2O3　doping　results　in　the　phase　transition　from　rhombohedral　to　tetragonal　phase,　the　increase　of　tetragonal　phase,　and　the　increase　of　grain　sizes　and　bulk　densities.　However,　when　the　concentration　of　Cr2O3　is　above　0.3wt%,　Cr2O3　will　inhibit　the　grain　growth　and　decrease　the　densities.　Cr2O3　doping　makes　the　materials　harder,　εr　decreases,　while　Qm　increases　with　the　increase　of　Cr2O3　while　the　tanδ,　kp　and　d33　exhibits　a　minimum　or　maximum　value　with　the　increase　of　Cr2O3　content.　The　most　optimum　piezoelectric　properties　can　be　obtained　with　the　concentration　of　Cr2O3　0.3wt%.