Composite particles of oxide superconductor were prepared using two kinds of aerosol processes one used an electrostatic force and the other was used a vibro-fluidized bed CVD reactor. The composite particle was constructed of an oxide superconductive core particle coated with fine particles and/or a thin film, of which secondary phases acted as a magnetic flux pinning centers and sintering aids etc. The microstructure control of composite particle and the enhancement of the pinning properties of sintered bodies were discussed.