The dielectric constant and dc conductivity in phase transition have been investigated of 0.005≤x≤ 0.030 of $(1-x) Pb(Ti_{0.99}Mn_{0.01})O_3 - xPbTa_2O_6$. Due to the lattice mismatch below the transition temperature, sintered bodies disintegrated spontaneously in the post furnace cooling process for 0.005≤x≤0.010. For x≥0.015, however, stable sintered bodies were obtained, which is presumably due to the grain size reduction in this composition range rather than the reduction of tetragonality. X-ray study shows that Ta can be dissolved up to x=0.010 and above this composition the second phase appears, the amount of which gradually increases with increasing Ta concentration. The fact that the solubility limit is x=0.010 is also proved by decreasing transition temperature with increasing amount of Ta up to x=0.010. At the high compositions the transition temperature remained constant with increasing Ta content. The imaginary part of dielectric permittivity exhibited an anomalous dielectric behavior around the transition temperature contradictory to Kramers-Kr$\ddot{o}$nig relation. The dielectric permittivity peaks broadened with increasing amount of Ta. Electrical dc conductivity also showed anormality near the transition temperature as in the dielectric permittivity data.
