Abstract: The dielectric properties and microstructure of Pb_1xBa_x(Zn_1/3Nb_2/3)O₃ ferroelectric ceramics were investigated.Two different ways of substituting Ba²⁺ for Pb²⁺ were adopted to obtain perovskite single phase structures.One way is wet mixing BaCO₃,PbO and ZnNb₂O₆.First the mixtures were calcined at 880℃ for 8h,then the calcined powders were ball milled and dried,finally the samples were pressed and sintered.The other way is that wet mixing ZnNb₂O₆ +BaCO₃ and ZnNb₂O₆ +PbO,respectively.The mixtures were calcined respectively at 880℃ for 4h,the two calcined powders were mixed in different ratios then ball milled and dried,the samples were pressed and sintered.The results show that for the ceramics prepared by two different adding ways the stabilization of perovskite phase of PZN-based ceramics increases and dielectric properties increase firstly and then decrease with increasing Ba²⁺ while Curie temperature of different compositions shifts to the low temperature.By comparing two adding ways,it's found that the temperature of the maximum of the dielectric constant（T_m） is lower and the grain size of ceramics are smaller for the former.More than 8mol% Ba²⁺ was needed to stabilize the 100% perovskitephase for the former while more than 25mol% Ba²⁺ was needed to obtain 100% perovskite structure for the latter.