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We used graphene as a support of uniform ruthenium nanoparticles to obtain Ru/graphene nanocomposites without sta-bilizing molecules.Graphene was showed to prevent the ruthenium nanoparticles from agglomeration.The chemical structures of the samples were investigated using X-ray powder diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX).The morphol-ogy was observed with field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM).The pore structures were studied by means of N2 adsorption and desorption at 77K.It was found that 2-10 nm ruthenium nanoparticles were uniformly distributed on a single graphene sheet or between graphene sheets.The weight percentage of ruthenium content on graphene could be easily controlled by reaction conditions.Because the resulting graphene-supported ruthenium nanoparticles were free from aggregation and without any surfactant molecules surrounding,they are promising for applications as active catalyst in sev-eral organic reactions.