A new type of composites of UHMWPE used for water lubricated bearings were prepared by using nanometer molybdenum disulfide and fluorine rubber to modify UHMWPE.The tribological properties of modified UHMWPE was studied on SSB100shafting test bench under different rotating speed,and the wear morphology was analyzed.Results show that the modification of UHMWPE by nanometer molybdenum disulfide can’t effectively improve the friction performance of the composites.The modification of UHMWPE by fluorine rubber can make the composites’ friction coefficient decline，but in some condition the friction coefficient shows a trend of fluctuation,and the minimum friction coefficient is got when the filling weight percentage of fluorine rubber is 20%.The friction coefficient of the composites modified by nanometer molybdenum disulfide and fluorine rubber is decreased with the increasing of the filling ratio of nanometer molybdenum disulfide and fluorine rubber.Friction performance and wear property of the composites achieve the optimal when the weight percentage of nanometer molybdenum disulfide and fluorine rubber is 8% and 16%,separately.