Abstract: The graphene dispersion solution was obtained by ultrasonic dispersion and added to the zirconium electrolyte.Micro-arc oxidation technology was used to prepare micro-arc oxidation film on the surface of AZ31 magnesium alloy.SEM and EDS were used to analyze the microstructure of the MAO coating, and XRD was used to analyze the phase composition of the MAO coating.The polarization curve of the MAO coating in a 3.5% NaCl solution was measured by the electrochemical workstation, and its corrosion resistance was analyzed.The results show that with the increase of Gr concentration, the content of C in the pores of the MAO coating first increases and then decreases, while the content of C outside the pores increases.The pore diameter and roughness of the MAO coating surface first decrease and then increase.The porosity increases, and the thickness hardly changes.Moreover, the concentration of graphene has no effect on the phase composition of the MAO coating, and the main phase composition is ZrO2,Mg2 Zr5 O12 and MgO.