The giant-dielectric-constant material CaCu3Ti4O12 (CCTO) has been successfully fabricated by oxalate coprecipitation method, which is done at lower temperature and shorter reaction time than the conventional solid-state reaction. The precipitation containing stoichiometric amounts of the metal cations was heat-treated to achieve single-phase CCTO. DTA/TGA was carried out on a dried precipitate to study the thermal decomposition process. The phases, microstructure and dielectric properties of the sample were characterized by X-ray diffraction, scanning electron microscopy and precision impedance analyzer. (C) 2008 Elsevier B.V. All rights reserved.