There are fast and slow polarization effects in organic liquids. For dielectric spectroscopy studies, the fast one can be described in frequency domain but the slow one can only be described in time domain. In differential time domain spectroscopy, each polarization mechanism contributes a peak. In differential time domain spectroscopy, each polarization mechanism contributes a peak. There are one fast peak and two slow peaks for benzene. The slow peaks are related to bound space charges and impurities in the liquid. In the melting process of paraffin, the slow peak splits. Mang important results related to the structure of liquid can be given by time domain method.

Key words: BENZENE, PARAFFIN WAXES, POLARIZATION