Abstract: PE fibers were first treated by atmospheric pressure helium(He) glow discharge plasma,then grafted with acrylic acid(AA) onto their surface so as to improve the hydrophilicity of PE fibers,The influences of different working parameters on the water contact angle and grafting yield were analyzed.IR and SEM,EDS were used to examine the morphological change of the treated PE samples. The results show that the change rule of water contact angle and grafting yield varies with working parameters.The grafted substrates indicate that polar groups have been successfully introduced onto the surface of PE fibers,and the hydrophilicity of PE fibers is obviously improved.