Abstract: Emulsions composed of nitrobenzene/water/sodium dodecyl sulfate (SDS) were prepared at different compositions.Specific conductivities in the oil-rich phase of emulsions were measured at different times in presence and without presence of hexanol.In order to find the relationship between stability and specific conductivities of emulsions, a new concept of a incremental ratio of specific conductivity ( κ _r) and a dynamic model of creaming process were proposed.Stability of emulsion was discussed by employing the relationship of the incremental ratio of specific conductivity with time and the dynamic parameters of creaming process.The results show that the stability of emulsion decreased with the increase of the incremental ratio of specific conductivity.In addition,the values of the changing ratio κ r with time, d κ r/d t ,at different times were calculated and the maximum values of d κ r/d t were obtained by using the plots of d κ _r/d t against time.The values of (d κ _r/d t ) _max and corresponding t max were also used to discuss the stability of emulsion.