Abstract: To improve unlubricated sliding wear properties of epoxy, potassium titanate whiskers were incorporated as fillers to fabricate composites. Effects of the content of PTW and wear conditions were studied. Based on the morphological observation of the worn surfaces and surface hardness of the composites, the possible wear mechanism was discussed. The results indicate that the addition of PTW can significantly decrease the specific wear rate and frictional coefficient of epoxy resin. The specific wear rate of the PTW filled epoxy composite (w(PTW)=0.08) is 10 times lower than that of unfilled epoxy and the frictional coefficient is decreased by 35%.