Abstract: Factors in process of UV photo-initiated grafting treatment to UHMWPE fibers woven are discussed. The inter-laminar shear strength (ILSS) of composites was used to characterize the treatment effect. The results show that UV photo-initiated grafting acrylamide is the best. After treatment, the ILSS of composites increased up to 18.85 MPa, almost twice that of untreated. The surface properties and morphologies of UHMWPE fibers before and after treatment were studied by SEM, FTIR and XPS.