Abstract: TC4 titanium alloy was selected as the substrate, and micro arc oxidation technology was used to build ceramic coatings for its surface treatment, which can improve the physical properties and anti-corrosion properties of titanium alloy.Taking sodium silicate, sodium hexametaphosphate and sodium fluoride solutions as electrolytes, the micro arc oxidation coatings were prepared on the surface of titanium alloys. By using SEM and XRD, the surface morphology and structural composition of the micro arc oxidation film were studied. The physical properties such as hardness, thickness, adhesion,insulation and fatigue strength of the film were tested, the anticorrosion properties were analyzed by salt spray corrosion test,moisture heat test and seawater immersion test. The results indicate that the corrosion resistance of titanium alloy micro arc oxidation film depends not only on its own phase structure and internal density, but also on the thickness, phase composition and structural defects of the oxide film.