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Various polycrystalline Ba1-x Lax (Ti0.5 Fe0.5 )O3 are prepared by using the standard solid state reaction technique.Pellet shaped samples prepared from each composition are sintered at 1200℃ for 5 h.X-ray diffraction pattes of these compositions confirm the formation of a single phase perovskite structure.The lattice parameters are decreased but the average grain size increases with the increase of La content.The dielectric constant,dielectric loss and ac conductivity are studied as a function of frequency for various compositions,and their behaviors are explained on the basis of the Maxwell-Wagner model A three-times enhancement of the dielectric constant is observed with the increase of La content.