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The structure, piezoelectric properties, aging rate and temperature coefficient of resonant frequency of( Pb0. 97Pr0. 03 ) [ ( Zn1/3 Nb2/3 )0.06 ( Sn1/3 Nb2/3 )0.06 ( Zr0. 43 Ti0.45 )0. 88] O3 + 0.5wt% MnO2 ceramics were investigated as a function of Cr dopant content. X-ray diffraction pattern indicates that all samples are all in the tetragonal side near the morphotropic phase boundary, and the tetragonality of PSZN-PZT ceramics is decreased with increasing Cr content.The EPR spectra and the piezoelectric properties of the PSZN-PZT ceramics prove that as the Cr content is low, and high valence of Cr ion plays an important role in ceramics. When Cr content increasing, the properties are dominated by the low valence of Cr ion. The solubility of the Cr in PSZN-PZT ceramics is about 0.7%. 0.5% ～ 0.7% of Cr and 0.5 % Mn are best stabilizers to improve the temperature dependence and aging rate of the resonant frequency of the PSZN-PZT ceramics.