Improvement thermal conductivity of immiscible polymer blends filled by hybrid fillers have attracted much attention in many thermal management fields. However, common method for achieving highest thermal conductivity have usually need high amount of conductive filler which result in poor mechanical properties and complex processing. using double percolation method with selective localization can be utilized as a solution for this problem. In the present work, the selective localization of boron nitride (BN) and Reduce graphene oxide (r-GO) in the immiscible polypropylene(PP) and polyamide 6 (PA6) blend is studied and investigation on the synergistic effect of hybrid fillers on thermal conductivity of polymer blend have been made. In this work the different composition of PP/PA6 have been studied in order to produce PP/PA/BN/r-GO thermally conductive composite with minimum volume fraction of fillers. The results of this study showed that hybrid fillers have good synergistic effect on thermal conductivity of PP/PA blend.