Carbon fiber was treated in the method of liquidphase oxidation for different times,and the etched surface topography was characterized by Scanning Electron Microscope (SEM).The acid modification carbon fiber reinforced fluorine rubber composites was prepared by the opening mixing mill and curing press,and the effects of carbon fiber content on the vulcanization characteristic,mechanical property and tribological performance of composites were studied.The results show that the carbon fiber surface groove become deeper and wider with the increasing of oxidation time,and the interface bonding function between modified carbon fiber and rubber matrix is improved.With the increasing of carbon fiber content,total crosslink density of the composite is gradually increased but the tensile property is decreased.The friction and wear properties of composites are improved significantly after adding the surface treated carbon fiber,and the friction coefficient is reduced by nearly 45% at most,the wear rate is increased nearly one times.The surface modification carbon fiber can make the friction coefficient and wear rate of the composite materials much lower,and improve the wear resistance.