Abstract: The surface of UHMWPE fiber was treated by a low temperature plasma. After the plasma treatment, the wetting power of UHMWPE fiber to ethylene glycol is improved and the contact angle is reduced. The active free radicals are produced on the fiber surface and the absorbability to methene blue is enhanced. The plasma treatment makes the fiber increase the oxygen content and surface area. The ILSS of UHMWPE/epoxy composite is enhanced more than 3 times.