In order to improve the shortcomings of high wear of polytetrafluoroethylene,four low content flakegraphite filled PTFE modified composites were prepared by coldpressing and sintering process,and their friction and wear properties were investigated at higher load(08 MPa) and at different rotational speeds.The depth of wear scar of the asprepared samples was observed by 3D video microscope,the surface microstructure of the composite was characterized by scanning electron microscope,and the wear mechanism of the composite was discussed.The results indicate that the friction coefficient and the volume wear rate of the PTFE composites after graphite filling are reduced to some extent at higher load.When the mass fraction of graphite is 5%,the composite has the lowest friction coefficient and volume wear rate,and compared with pure PTFE,the friction coefficient and the volume wear rate are reduced by 197% and 8425% at the speed of 80 r/min separately.The wear mechanism of the composites is gradually changed from plowing to adhesive wear with the increase of the graphite content at higher load,and when the mass fraction of graphite is 10%,the slight fatigue wear occurs.