Abstract: The penetration of Gd element in gaseous phase into PbTiO₃ ceramics was reported. It is confirmed that as a result of penetration Gd into PbTiO₃ ceramics, the conductivity and the dielectric characteristics of PbTiO₃ ceramics are improved obviously. The resistivitiy of Gd-penetrated PbTiO₃ ceramics decreases from 2.0×10¹⁰Ω·m to 0.25Ω·m, which is approaching to that of conductor. The grain resistance and the grain boundary resistance decrease with increase of temperature, so that the electrical conductivity is improved. The dielectric constant of Gd-penetrated PbTiO₃ ceramics increases obviously.