This article relies on the effect of two types of nanoparticle on morphology and dynamic-mechanical properties of polyvinyl chloride (PVC)/acrylonitrile butadiene rubber (NBR) blends. The results of mechanical investigation revealed that tensile strength and modulus of PVC/NBR nanocomposites reinforced with 1 phr of single-walled nanotube (SWNT) are very close to the case of reinforced with 5 phr of nanoclay. The outcomes of dynamic-mechanical properties revealed that the storage modulus increases with the addition of nanoparticles and the intensity of tan get reduced, in two cases. Morphological investigation of nanocomposites was determined by scanning and transmission electron microscopy. In the case of PVC/NBR/nanoclay, fracture surface of specimens were much rough while the fracture surface of virgin PVC/NBR was very smooth. In PVC/NBR/SWNT nanocomposites, with introducing of carbon nanotubes to polymer matrix, dispersion and distribution of NBR as minor phase in PVC as matrix got improved.