This paper reports the rapid synthesis of perovskite (ATiO(3), A = Ca, Sr, Ba) via molten salt method within 10 min BaCl2 or CaCl2 was used due to their excellent solubility of O2- which enables faster mass transfer transport in the liquid phase. TiO2, ACl(2) and CaO (or BaCO3) were used as the precursors. The obtained ATiO(3) show high chemical and phase purity. Studies found that cation size in ATiO(3) plays an important role in the transformation between different perovskites. The method may provide a generalized methodology for rapid preparation of other important perovskites.