Solvent effect on the charge storage ability of the polypyrrole have been studied in two different ways:analyzing both the ion-solvent and polymer-solvent interactions and by a multiple regression procedure. The first way was not sufficient to explain all the results obtained. By the multiple regression, influence of the four different Variables of the solvents simultaneously has been obtained. Solvents having high dipole moments and low polarizability and having a high capacity to donate electrons are the best solvents among those investigated in this paper to obtain high charge storage abilities.