The invention discloses a method for solving problems of expanding, softening and falling-off of positive active material of a storage battery. The method comprises the step of subjecting the positiveelectrode or positive active material of the storage battery or/and storage battery pack to a storage battery negative electrode reaction, or reducing same to a metal or 0 valence by means of an electrochemical reduction reaction, or subjecting the positive electrode and/or negative electrode of the storage battery or/and storage battery pack to polarity reversal and subsequent charging or charging and discharging operations. The method is also used for solving other problems of the storage battery, which include, but are not limited to, one or more of the corrosion, passivation, salinization, crystallization and specific surface area shrinkage of the electrode active substance, the poor contact of the active substance with a current collector or/and the active substance falling off of the current collector, and the premature capacity loss, memory effect and decomposition of the active substance itself. The method disclosed by the invention can solve problems such as expansion, softening and falling-off of the positive active material of the storage battery, and significantly improve or extend the service life of the battery or the battery pack.