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The graphene nanosheets were dispersed in the superalloy powder by using the wet mixing method, and then the nickel based FGH96 P/M superalloy was prepared with hot isostatic pressing(HIP)+hot extrusion(HEX)+hot isothermal forging(HIF)+heat treating(HT) processes. The results show that the graphene well disperses in the superalloy powder and keeps its original form during the following hot processing. After 0.1%(mass fraction) graphene is added, the average room temperature tensile strength and yield strength increase by 58MPa and 43MPa respectively, and the ductility increases from 21.0% to 37.3%; the tensile strength and yield strength at 650℃ increase by 58MPa and 28MPa, and the ductility increases from 18.5% to 26.5%. The mechanism of strengthening and toughening reinforcement was also analyzed based on graphene reinforced FGH96 superalloy.