Toughening enhancement has always been an important target of polymer blending. This work was to explore the localization effect of carbon nanotubes (CNTs) on morphology and mechanical properties of PP/EOC blends. The melt viscosity measurements were used to study the effect of the sequence of mixing on CNTs localization. The results of frequency sweep experiment showed a pronounce enhancement in storage modulus together viscosity upturn for the nanocomposites, which were prepared by PP based master batch feeding method. Whereas, no enhancement in storage modulus (G’) was observed for the nanocomposites, which by direct or sequential feeding. In addition, for the nanocomposites by master batch feeding, CNTs located in PP matrix while for the samples prepared by later two methods, the nanoparticles were accumulated in EOC phase or interface. The results of mechanical test showed the greater improvement in toughness for the samples in which nanotubes was located in the PP matrix as a result of CNTs induced reduction in EOC particle size as evidence by scanning electron microscope (SEM) macrographs.