The　CCTO　(CaCu3Ti4O12)　dielectric　ceramics　were　prepared　by　the　solid　state　reaction　method.　Stoichiometric　amount　of　powders　were　mixed　in　distilling　water　by　ball　milling　with　zirconia　media　for　12　hours　and　after　drying,　the　mixed　powders　were　calcined　in　air　at　950°C　for　2　hours.　The　calcined　powders　were　milled　again,　and　5　wt%　PVA　was　added　and　pressed　into　disks,　that　were　sintered　at　a　higher　temperature　range　of　1100°C　to　1150°C　and　cooled　to　room　temperature　in　the　furnace.　The　crystalline　phases　of　the　samples　were　identified　by　Powder　X-ray　diffraction　(XRD)　analysis,　and　microstructure　of　ceramics　were　carried　out　in　a　scanning　electron　microscope.　The　dielectric　properties　and　impedance　analysis　of　the　ceramics　were　determined　using　the　precision　LCR　meter.　The　results　show　that　oxygen　in　CCTO　is　easier　to　lose　in　sintering,　leading　to　lower　resistivity　and　larger　permittivity　of　the　grains.