() Dielectric properties of polycrystalline CaCu Ti O CCTO pellets sintered in the 34 12 temperature range 10001200C were evaluated with impedance spectroscopy at frequency range of 10 2 to 10 7 Hz from 90 K to 294 K. A correlation has been established between the pair values of low frequency limit dielectric constant and the total resistivity and the sintering temperature. For example, the sample sintered at 1100C demonstrates higher value of low frequency limit dielectric constant and lower value of total resistivity, while the sample sintered at 1000C demonstrates lower values of low frequency limit dielectric constant and higher value of total resistivity. This correlation has been successfully explained by relating with the difference in grain size and grain volume resistivities of these two polycrystalline CCTO samples. Further, it is suggested that donor doping of oxygen vacancies Vo and Vo may be the reason to cause the difference in the grain volume resistivities of these two samples.