In order to enhance the transparency and impact properties of iPP, the physical blending method was used to modify the iPP with the combination of elastomer SEBS and NX8000K nucleating agent. Differential scanning calorimetry (DSC), X-ray diffraction analysis (XRD), and polarization microscope analysis (POM) were used to study the effects of SEBS on the crystallization behavior, transparency, and mechanical properties of iPP/NX8000K complexes. The results showed that when the NX8000K content is 0.6 %( mass fraction, same as below) and the amount of SEBS is 40 %, the haze of the iPP/NX8000K/SEBS ternary composition reduced to 24.9%, which is 54.7% lower than that of pure iPP; the impact strength is increased to 50.7 kJ/m2, which is 10 times higher than that of pure iPP.