In this work the flow induced orientation and the mechanism governing for structural recovery of multi-walled carbon nanotube filled polypropylene nanocomposites were investigated. A series of melt linear and nonlinear rheological measurements including start-up flow test and time sweep experiments were performed in order to study the structural breakdown and/or nanoparticles orientation and subsequent structural recovery at different temperatures and MWCNT loadings. The results showed that the structural recovery occurs in two stages. The first quick recovery which was independent of temperature could be explained in terms of interparticle van der Waals interaction. This stage which was named as “initial aggregation” and had major role in increasing storage modulus. The second stage of recovery (secondary aggregation) that was much slower, was found to be highly dependent on temperature and therefore was attributed to rotary diffusion of nanoparticles. These result were in good agreement with those calculated using van der Waals and diffusion concepts.