Bamboo fibers(BF) treated by different concentration of NaOH and Polyformadehyde (POM) were employed to prepare composites via twinscrew extrusion.A series of POM composites were produced by injection moulding. Results show that the friction coefficient of composites filled with 125% NaOH treated BF is 015 and its wear rate is decreased by 446% compared with pure POM under drysliding. The worn surface of different friction pairs was observed by scanning electron microscope to analyze the wear mechanism. It is found tht some worn grooves occurr on pure POM surface,while the worn surface of POM composites filled with bamboo fibers has no worn groove,but the fatigue wear occurrs.