The flow induced orientation and re-structuring kinetics of anisometric nano particles can play a significant role in determining the nanoscopic structure and physical and mechanical performance of the finished product. The aim of the work presented here is to determine the effect of aspect ratio and deformation history on the orientation and re-orientation kinetics in anisometric containing nano particles. The contribution of applied shear stress and thermodynamically controlled re-structuring as two competitive parameters were evaluated by using a combination of linear and non-linear viscoelastic experiments. Two sets of PEO based nanocomposites, one containing laponite (LRD) and the other with multi walled carbon nanotube (MWNT) prepared via melt compounding process were considered. All rheological measurements were performed on the samples at above their percolation threshold. The results of stress transient test along with time and frequency sweep tests showed that while the extent of decrease in low frequency storage modulus with increasing shear stress was stronger for MWNT containing samples than that for LRD filled samples. It was demonstrated that although the potential of MWNT for network formation is greater than that of LRD, the faster re-orientation kinetics of LRD act as dominating parameter. Keywords: Orientation, Kinetics, Aspect ratio, Rheology