Abstract: The fiber-resin adhesion has been reinforced by plasma treatment on Ultra-high Molecular Weight Polyethylene(UHMW-PE)fibers. The mechanism of the surface change,as is reported in this paper, has been studied by the pull-out test,XPS,SEM, contact angle measurements. Giving the quantitative an alysis of the applied forces affecting the surface adhesion, we discuss the roles of the three main factore playing in the fiberresin adhesion,and their relation to plasma parameters.The three main factors are the key mechanimal effects,the the mical bonding effects and nonpolar dispersion force.