Epoxidized natural rubber (ENR) nanocomposites were prepared in latex state by using unmodified and modified surface of nanosilica. Influence of surface modification and content of nanosilica on dynamic mechanical properties as a function of frequency (i.e., complex viscosity (η*), storage modulus (G ́) and loss modulus (G”) of ENR nanocomposites were investigated. It was found that surface modification of nanosilica improved rheological properties of nanosilica filled ENR nanocomposites. Moreover, greater nanosilica contents caused increasing of η*, G ́ and G”.