The 0.15BiScO3-0.85(Pb0.88Bi0.08)(Ti0.97Mn0.03)O3 (BSPT-Mn) high-temperature piezoelectric ceramics were prepared by traditional solid-state method in the sintering range of 1 125-1 175 ℃. All samples are pure phase, and the distribution of grain sizes follows the normal distribution pattern. The dopant elements are uniform and no significant enrichment phenomenon is observed. The results show that the BSPT-Mn high-temperature piezoelectric ceramic prepared by sintering at 1 150 ℃ achieved a maximum mechanical quality factor of 1 500.3, and exhibited good piezoelectric properties with dielectric constant d33 of 289.8 pC/N at a working temperature of 484.4.