Composite containing metal fibers would be applied widely in the field of electromagnetic interference for excellent electromagnetic shielding effectiveness (EMSE). In the study, two kinds of composite, the 316L fibers/epoxy resin composite and the Cu fibers/epoxy resin composite, were achieved using infiltration and mechanical stirring methods, respectively. The EMSE of composite was assessed. The results show that the EMSE of 316L fibers/epoxy resin composite increases gradually with the aspect ratio of fibers increasing from 200 to 1000, while it decreases quickly with that from 1000 to 3000. Furthermore, the EMSE of the composite increases gradually as the content of fibers increases from 10wt% to 25wt%. Additionally, for the 316L fibers/epoxy resin composite, the optimum parameters of 316L fibers are the diameter of ?8μm, the content of 25wt% and the aspect ratio of 1000, and the highest EMSE of the composite is about -78dB. For the Cu fibers/epoxy resin composite, the optimum parameters of Cu fibers are the diameter of ?120μm and the content of 2.0wt%.