Abstract: Polytetrafluoroethylene(PTFE) composites with different contents of acicular wollastonite and flake graphite were prepared by a cold moldingsintering method, and their friction and wear properties were investigated by the analysis of worn surface and transfer film with scanning electron microscope (SEM).The results indicated that, although the wear rates of the composites decreased with an increase of wollastonite and graphite contents, the wollastonitefilled composites presented a lower wear rate at the same filler content.Compared to pure PTFE, the PTFE composites with graphite exhibited a smaller friction coefficient but the composites with wollastonite presented the higher value.Two different friction mechanisms could be deduced for the PTFE composites with different fillers according to the SEM observation on friction surfaces.The load dissipation was attributed to the accumulation of wollastonite at the sliding interface during the friction process, whereas the slipping and peeling effect of graphite in PTFE composites promoted the formation of transfer film.Moreover, the synergistic effect was achieved by a combination of 20 wt % wollastonite and 5 wt % graphite, which led to a further decrease in wear rate.The wear resistance of PTFE composites was improved by a factor of 200 compared to pure PTFE.