(1-x)BaTiO₃-xZnNb₂O₆ (x=0.5mol%, 1mol%, 1.5mol%, 2mol%, 3mol%, 4mol%) (BTZN) ceramics were synthesized by solid state method. The sintering temperature, structure, dielectric property and ferroelectric property of BTZN ceramics were systematically investigated. The sintering temperature of BTZN ceramics decreased with increasing ZnNb₂O₆ content. XRD results show that the second phase Ba₂Ti₅O₁₂ was observed when the content of ZnNb₂O₆ reached 3mol%. The dielectric measurements result showed that with increasing ZnNb₂O₆ content, the dielectric constant of BTZN ceramics decreased gradually, while the frequency stability of dielectric constant increased gradually. The temperature dependence of dielectric constant results showed that all BTZN ceramics met the characteristics of X8R capacitors. Polarization values of BTZN ceramics decreased with increasing ZnNb₂O₆ content. The dielectric breakdown strength of 240 kV/cm and a recoverable energy density of 1.22 J/cm ³ were achieved in the sample of x=4mol%.