Abstract: The graphene reinforced aluminum matrix composites were fabricated by friction stir processing used 5052 aluminum alloy as the matrix materials, and the influence of graphene addition on the dispersivity and mechanical properties was investigated. The results show that the graphene can uniformly disperse within the matrix when the addition amount of graphene is no more than 1.0wt%. The microhardness of the composites displays a general ascending trend with the increase of graphene addition amount, and the average microhardness reaches 87.44 HV when the graphene addition amount is 2.0wt%. Compared with the unreinforced aluminum alloy, the microhardness of the composites is increased by 64.3%.However, the strength of the composite increases first and then decreases with the increase of addition amount of the graphene. When the addition amount of the graphene is 1.5wt%, the yield strength and tensile strength of the composites are 139.0 MPa and 247.5 MPa, respectively. The yield strength and tensile strength of the matrix under the same conditions are increased by 63.1% and 24.5%, respectively.