Abstract: Abstract：A highly branched hydrophobic carbon chain is introduced on the surface of graphene oxide（GO） by the covalent bonding of epoxy and carboxylic acid， wherein， glycidyl ester （CarduraTM E-10P） is used as a hydrophobic monomer. The modified graphene oxide（F-GO） is added as an anti-rust filler to epoxy resin to obtain the F-GO／epoxy composite material. Structural properties are characterized by Fourier transform infrared spectrometer （FT-IR）， Raman spectroscopy， X-ray diffraction （XRD） and Thermal gravimetric （TG）. In addition， morphological properties are observed with Field-emission scanning electron microscopy （FE-SEM）. The corrosion behaviors of the coated steel substrates are evaluated by Neutral salt spray （NSS） and Electrochemical measurements. The results show that E-10P can inhibit the agglomeration of lamellae by its steric effect. The hydrophobic effect enhances the thermal stability of F-GO and compatibility of epoxy resin. When the additive amount of the composite is 02％， the corrosion current of anti-corrosive coating with a thickness of 20-25 μm can be reduced from 2358 6×10-6 A／cm2 to 2000 2×10-11 A／cm2 and the impedance value can be increased from 11×107 Ω·cm2 to 69×109 Ω·cm2.