Y-Ba-Cu-O and Bi-Pb-Sr-Ca-Cu-O superconductor powders were synthesized by the mist pyrolysis method. The crystalline phase and morphology of mist-pyrolyzed powders depended on the heating temperature, heating time, and concentration of starting solutions. Superconducting phase of Y-Ba-Cu-O and Bi-Pb-Sr-Ca-Cu-O superconductor (low-T_c phase) were obtained directly by this method. Sintered body of Y-Ba-Cu-O superconductor obtained by using mist-pyrolyzed powder had a density of above 95% of the theoretical density. The critical temperature (T_c) of Y-Ba-Cu-O superconductor (T_c end point) was 90 K and its critical current density (J_c) was above 230 A/cm² (at 77 K). The T_c value of sintered Bi-Pb-Sr-Ca-Cu-O body was increased from 55 K to 103 K, because the low-T_c phase was converted to high-T_c phase by the long heat treatment. The optimum J_c value of Bi-Pb-Sr-Ca-Cu-O sintered body was 172 A/cm² (at 77 K).