Abstract: The anti-corrosive coating was prepared by graphite nanosheets (GNs), epoxy emulsion (EP emulsion) and its curing agent, and the anti-corrosive mechanism of the GNs/EP emulsion anti-corrosive coating with graphite was analyzed. The best GNs amount is 4% of epoxy resin in EP emulsion, as a result of the salt spray testing, with the breaking time is 240 h, and its corrosion under the scribe line or an area of damaged edge corroded for 200 h is smaller than the Fe₂O₃/EP coating. The anti-corrosive ability of the GNs/EP emulsion coating is enhanced by the improvement of the GNs distribution, as could be seen from the SEM images of the coating surface. GNs/EP emulsion coating film has the higher corrosion potential and smaller corrosion current listed in the Tafel testing, as the result of the dielectric constant increased by the miniature capacitor formed with epoxy and well distributed GNs, the electric charge storage ability is enhanced and the electron transfer ability is reduced by this. As a result, the anti-corrosive model of GNs/EP emulsion coating is formed employing the Nyquist diagrams and the SEM images of GNs/EP emulsion coating cross section. The function of the anti-corrosive GNs/EP emulsion coating is attribute by the physical function to defend the H₂O and O₂ employing the high chemical stability of GNs and the electrochemistry function to reduce the electron transfer ability by forming the miniature capacitor.