Graphene nanosheets (GNFs) reinforced aluminum composites were fabricated by spark plasma sintering (SPS) with different temperature and holding time. The microstructure and tensile properties of the composites were prepared and analyzed. Results show that the SPS process affects the mechanical properties of the composites by regulating the characteristic of GNFs/Al interface. When sintering at 500℃, the interfacial reaction of GNFs/Al is inhibited, but the interface bonding of graphene/aluminum is weak, which result in the low mechanical properties of the composite. When sintering temperature is increased to 560℃, the mechanical properties of composite significantly improved, which result from the GNFs/Al interface bonding force is obviously enhanced and the interface reactions is effectively control by rapid sintering. In addition, GNFs can also inhibit the coarsen of aluminum matrix grain with the sintering temperature increases.