In this study, (1−x)Sr 0.75 Ba 0.25 Nb 2 O 6-x[0.94Bi 0.5 Na 0.5 TiO 3-0.06BaTiO 3 ] solid solution ceramics were prepared and investigated. The length-diameter ratio of pillar-like grain increased with increase in x, reaching maximum value of 10.5 at average length of 1.36 μm and diameter of 0.13 μm for x = 0.20. The maximum dielectric constant, temperature corresponding to the maximum dielectric constant, and saturated polarization decreased, respectively, from 507, 36°C, and 3.2 μC/cm 2 for x = 0 to 365, −61°C, and 2.0 μC/cm 2 fort x = 0.10, and then increased to 1167, 43°C, and 5.5 μC/ cm 2 for x = 0.20. These results indicate the competitive effects of B-site Ti 4+ and A-site Ba 2+ on ferroelectricity.