We shall introduce new concepts of near-rings, that is, strong reducibility and left semi ${pi}$-regular near-rings. We will study every strong reducibility of near-ring implies reducibility of near-ring but this converse is not true, and also some characterizations of strong reducibility of near-rings. We shall investigate some relations between strongly reduced near-rings and left strongly regular near-rings, and apply strong reducibility of near-rings to the study of left semi ${pi}$-regular near-rings, s-weekly regular near-rings and some other regularity of near-rings.