To investigate the effect of reoxidation on the grain‐boundary acceptor‐state density of reduced barium titanate,n‐doped BaTiO3ceramics are sintered in a reducing atmosphere (2% H2+ 98% N2) and then annealed in oxygen. After annealing at 1150°C for different times, the experimental results show a relationship between temperature‐averaged acceptor‐state density and annealing time asNs=NsoBt1/nwithnbetween 2 and 3. An inherent acceptorstate densityNso= 4.25 × 1012cm−2is obtained with an increase rateB= 4.8 × 1012cm−2. min−1/3, whennreaches 3. The inherent grain‐boundary acceptor states in the reducedn‐doped BaTiO3ceramics are believed not due t