Nd-doped BiScO₃-PbTiO₃ (BSPT) high-temperature piezoelectric ceramics were prepared using a conventional solid-phase reaction method. Regarding the determination of the morphotropic phase boundary of BSPT, the effects of Nd doping on its structure and properties were systematically investigated. The results show that the phase structure and domain structure of BSPT ceramics can be regulated by Nd doping, which can effectively improve its piezoelectric properties and temperature stability. When the doped BS content is 37 mol%, and the Nd doping concentration is 3.0 mol%, it has the best piezoelectric properties, with a piezoelectric constant d₃₃ of 620 pC/N, Curie temperature of approximately 405 ℃, and good temperature stability.