Abstract: In order to improve ultrahigh molecular weight polyethylene(UHMWPE) fiber′s interfacial properties,surface modification of UHMWPE fibers was done by argon plasma method of dielectric barrier discharge.The warp-wise and filling-wise tensile properties of the treated and untreated UHMWPE/LDPE were compared with those of LDPE composite of same volume fraction respectively.It was found that adhesive property of treated UHMWPE fiber was enhanced significantly,and its interface property was studied.