This paper reports the relationship between the conductive property and the ultravioletvisible spectrum in Mn-doped BaTiO 3 -based ceramics. It was observed that the conductance increased with the addition of Mn in BaTiO 3 . Ultraviolet-visible absorption effects were observed in the pure BaTiO 3 and the doped BaTiO 3 ceramics as well. The addition of MnO 2 resulted in an increase of absorption wavelength. The phenomenawere discussed in terms of the change of the band-gap energy between valence band and conduction band. According to the mechanism, similar electrical and optical behaviors were predicted and shown in a parallel system, Mn-doped barium strontium titanate ceramics, Ba 0.93 Sr 0.07 TiO 3 .