Lead-free and high-temperature 0.71BiFeO(3)-0.29BaTiO(3) ceramics with Mn modification (BF-BT-x %Mn) were fabricated by conventional solid-state reaction method, and the high temperature dielectric, ferroelectric and piezoelectric properties were investigated. All compositions exhibited pseudo-cubic phases. Mn modification improved the electrical properties of BF-BT solid solutions at both room and high temperature. The Curie temperature T (C), depolarization temperature T (d), dielectric constant epsilon (r), dielectric loss tan delta, piezoelectric constant d (33), electromechanical coupling factor k (p), remnant polarization P (r) of BF-BT-1.2 %Mn ceramics were 506, 500 A degrees C, 556, 0.04, 169 pC N-1, 0.373, 31.4 mu C cm(-2), respectively. The epsilon (r), tan delta, and k (p) of BF-BT-1.2 %Mn ceramics were stable with the increase of temperature until 500 A degrees C. The coercive field E (c) of BF-BT-1.2 %Mn ceramics was nearly 30 kV cm(-1) at 200 A degrees C, which was much larger than those of PZT, BS-PT,BNT and KNN ceramics. The high field strain coefficient d*(33) reached as large as 525 pm V-1 at 200 A degrees C. These results showed that the BF-BT-x %Mn ceramics were promising candidate for high temperature piezoelectric applications.