Abstract: By taking the exact size of the conductivity cell as well as the resistance values at diffevent depth, the conductivity was calculated using the following equation:\[\begin{array}{l}\sigma = \frac{1}{{2\pi \Delta {\rm{h}}}}{\rm{(}}\frac{{\rm{1}}}{{{{\rm{R}}_{\rm{2}}}}}{\rm{ - }}\frac{{\rm{1}}}{{{{\rm{R}}_{\rm{1}}}}}{\rm{)ln(}}\frac{{{{\rm{D}}_{\rm{2}}}{\rm{ - m}}}}{{{{\rm{D}}_{\rm{1}}}{\rm{ - m}}}}{\rm{ \bullet }}\frac{{{{\rm{r}}_{\rm{1}}}}}{{{{\rm{r}}_{\rm{2}}}}}{\rm{)}}\\{\rm{or}}\\\sigma = \frac{{{{\rm{K}}^*}}}{{\Delta {\rm{h}}}}{\rm{(}}\frac{{\rm{1}}}{{{{\rm{R}}_{\rm{2}}}}}{\rm{ - }}\frac{{\rm{1}}}{{{{\rm{R}}_{\rm{1}}}}}{\rm{)}}\end{array}\]Therefore, the procedure of demarcating the constant of the conductivity cell by using a know solution can be omitted.With this new mefhod, the experimental procedure has been simplified and the results proved accurate.