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Sr 0.7 La 0.3 TiO 3−α specimens were prepared in reducing atmosphere, and the structural and electrical properties were studied. The lattice parameter of Sr 0.7 La 0.3 TiO 3−α at room temperature was larger than that expected from Vegard's law between SrTiO 3 and LaTiO 3 due to the reductive expansion. The conductivity of this specimen was 100 S cm −1 at 1000 • C, p O 2 = 10 −13 Pa. However, the conductivity was not preserved after an oxidation-reduction cycle. Over p O 2 = 10 2 Pa, the conductivity drastically dropped with increasing p O 2 . The thermal expansion coefficient of Sr 0.7 La 0.3 TiO 3−α was 11.8 × 10 −6 K −1 in 9% H 2 /N 2 (room temperature -1000 • C). In this Sr 0.7 La 0.3 TiO 3−α , the chemical expansion on oxidation reached l/l o = 0.51%, when changing p O 2 from 10 −11 Pa to 2 × 10 4 Pa (air) at 1000 • C.