In this paper, aiming at the problem of non-infiltration between FeCuNbSiB amorphous alloy strips and epoxy resin matrix, the interface layer of Cu_0.75Fe_2.25O₄ and Fe₃O₄ phases, which the thickness was about 5μm~10μm, was successfully obtained on the both sides of FeCuNbSiB amorphous alloy strips by surface chemical modification. The interface layer has high bonding strength with FeCuNbSiB amorphous alloy strips, and good infiltration with epoxy resin matrix. The epoxy resin matrix composites using the amorphous alloy strips as reinforcing materials were prepared according to FSS grid design, the electromagnetic wave absorption peaks of composite board appeared in the frequency range of 13-18GHz and the value of reflectivity R was between -5dB and -10dB.The value of absorption peaks kept constant but absorption peak frequency bands shifted to lower frequency along with increasing the layer number of FeCuNbSiB strips. This kind of character can be used to modify radar absorbing properties of other composites and broaden absorption band.