Abstract: In this work, a novel approach was developed for obtaining a strong three-dimensional network of heat conducting path by filling alumina (Al2O3) and graphene sheets (GR) into poly(ethylene-co-vinyl acetate)(EVA). This unique structure effectively prevents the inter-sheet restacking of graphene sheets and minimizes the thermal contact resistance between fillers and interface. The resultant exhibits a high thermal conductivity of 2.4060.07 W/m K, which is much higher than single filler at the same loading. Additionally, a strong synergistic effect can also be observed, and three-dimensional schematic models were simulated for this enhancement.