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Abstract. Carbon nano fiber (CNF) was modified by acid oxidation and maleic anhydride (MA) graft in current modification. The CNF filler surface properties were characterized by energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS). In addition, the properties of epoxy resin with modified CNF filler were indicated by thermogravimetric analysis (TGA) and mechanical analysis, and fracture morphologies were also observed by scanning electron microscope (SEM). The results show that the complex modification is a favorable surface modification for CNF filler, which would not only improve interfacial property between CNF and resin, but also increase the thermal decomposition temperature and mechanical character of epoxy resin.