According to the unique working conditions of hydraulic reciprocating seal,such as low friction,high wear resistance,high pressure resistance,extrusion resistance and hydraulic oil resistance,PEEK material was modified by Polytetrafluoroethylene (PTFE) and carbon fiber.The mechanical properties and friction and wear properties of the modified PEEK material were studied and compared with the modified polytetrafluoroethylene(PTFE) material.The sealing structure was designed reasonably and the performance of the seal consisting of modified PEEK and elastomer at different temperatures were stimulated and analyzed by finite element method,and the simulation analysis results were verified by experiment.The results indicate that the friction coefficient of PEEK filled with 20% PTFE is the lowest and it has no obvious effect on the steel counter face,so it is suitable for hydraulic reciprocating seal.The combined seal can effectively overcome the defect of poor elastic properties and difficult installation of PEEK material.The results of finite element simulation show that the combined seal reveals outstanding performance at the condition of the pressure as high as 42 MPa at different temperatures.The sealing function experimental result shows that the starting friction and leaking rate of the combined seal is smaller and the leakage rate is lower than that of the single PEEK material seal.It is proved that the modified PEEK material can replace PTFE and nylon to apply in the field of hydraulic reciprocating seal.