Abstract: The tribological properties of graphene oxide(GO), polyethylene glycol (PEG) and different proportions of the GO/PEG composites were researched through pin and disc experiment, and the lubrication effect of PEG intensified by GO was investigated in UHMWPE-CoCrMo artificial joint materials. The structure and properties of GO/PEG composites were studied by FTIR, XRD and Laser Roman spectrometer in detail.The results show that the GO/PEG composites including 0.85wt% GO and 40wt% PEG have good lubrication effect, the average friction coefficient achieves 0.015 under the condition of 0.024 m/s sliding speed and 4.2 MPa load. GO is dispersed in PEG solution homogeneously, and the lubrication effect of GO/PEG composites can be improved significantly by the strong interfacial interactions between both components.