The effect of sintering temperature (ranging from 1055 to 1200 A degrees C) on the phase ingredient and dielectric property of the nominal BaTi2O5 ceramics (starting with the Ba/Ti of 1:2) fabricated by a spark plasma sintering method were systematically studied. At the first stage, BaTi2O5 component was enhanced in the sintering temperature range of 1055-1120 A degrees C; it turned out to be the dominant phase. For these BaTi2O5 phase dominated ceramics, the Curie temperature T (c) rised on increasing the sintering temperature and saturated around 440 A degrees C with the maximum dielectric constant of 500. Further increasing the sintering temperature, the decomposition of the obtained BaTi2O5 into BaTiO3 extensively happened; the ceramics turned to be the BaTi2O5 and BaTiO3 coexisting state. These ceramics can be characterized by two dielectric anomalies. One at similar to 420 A degrees C stood for the phase transition of BaTi2O5 while the other at similar to 150 A degrees C stood for the transition of BaTiO3, which is exceptionally high as the normal BaTiO3 ceramics. Further increasing the sintering temperature (until 1200 A degrees C) would dramatically enhance the BaTiO3 phase; the ceramics showed T (c) at 130 A degrees C with the maximum dielectric constant of 1800.