The crystallization behavior, the physical properties and the crystal morphology of β-NA nucleated iPP were investigated in the current research. Experimental results indicated that the crystallization temperature of iPP was raised to about 120 °C upon the addition of β-NA by only 0.20 wt%. Double DSC melting peaks verified the existence of both β and α phase in the β-NA modified iPP. XRD patterns confirmed the predominant existence of the β-crystal phase by around 0.85 (or 85%) when 0.10 wt% of β-NA was employed.