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The phase structure and electrical properties of pure and La2O3-doped BiInOa-PbTiO3 (BI-PT) ceramics were studied respectively.In (1-x)BI-xPT (x=0.72-0.80) ceramics,the stability of tetragonal phase increased with increasing x,and pure perovskite structure was obtained for x=0.80 ceramics.The phase transition temperature range was between 575 ℃ and 600 ℃for x=0.72-0.80 ceramics,higher than that of PT (～490 ℃).The c/a ratio almost linearly decreased with increasing La2O3 content in x=0.80 ceramics.It is believed that Pb2+ vacancies were formed by La3+ substituting Pb2+ in La2O3-doped BI-PT ceramics.Tc shifted to lower temperature by 30 ℃/mol% La2O3.The maximum dielectric constant 8557 around 559 ℃ was exhibited in 0.5mol%-doped BI-0.80PT ceramics.La2O3-doped ceramics could be poled resulting from decreasing of c/a ratio and improving of dielectric loss and resistivity.The maximum piezoelectric coefficient d33 was 12 pC/N for 2mol%-doped BI-0.80PT ceramics.