To easily and surely sort the powder consisting of a resin alone mingled in chargeable powder from the normal chargeable powder consisting of the resin coupled to conductive metallic powder.

This method is applied to the chargeable powder in which ≥2 kinds of the powder having a difference of at least ≥1 g/cm3 in average specific gravity is incorporated. The chargeable powder is fed into liquid and is agitated to separate the powder of different kinds by the specific gravity difference.