We reply to recent comments about our experimental results by Choi et al. They reanalyzed our data of dielectric spectra using Cole-Cole equation and considered that this approach not only well fitted our dielectric data, but also deduced achievable polarizability that could be used to explain the ER enhancement in mesoporous ER system. Indeed, the Cole-Cole plot can provide further information that is difficult to be directly detected by dielectric spectra technique due to limitation of frequency range. We feel that the use of this approach may be reasonable to deduce some available information for further understanding ER effect. (c) 2005 Elsevier B.V. All rights reserved.