Objective Targeting at the shedding problem of projectile base of a type of shrapnel in our factory during test, the cause for which was revealed through analysis to be the low resistance of the anode oxidation film against the high-temperature gunpowder gas ablation. Adoption of the method of spraying high-temperature ablative resistant coating led to erosion of small holes. In contrast, micro-arc oxidation, as a surface strengthening technology that directly produces ceramic layer on the surface of the metal, has excellent resistance to erosion, 100 μm thick film can resist impacting of 2500 ℃ high temperature air, and does not fall off after 20 seconds. Therefore, the method of micro-arc oxidation was used to dispose the projectile base. Methods With elastic bottom as the anode, stainless steel electrolytic cell as the cathode, bipolar micro-arc alternating pulse oxidation power supply and constant current were used. Formula of electrolyte was phosphate system electrolyte, with temperature of 20 ℃ to 40 ℃ and processing time of 80 min ~ 90 min. Results After detection of specifications indexes of the micro-arc oxidation coating, such as appearance quality, thickness, adhesion strength, corrosion resistance and erosion resistance and assessment of shooting range test, the quality of micro-arc oxide film layer was obviously better than that of the anode oxide film, the projectile base did not show ablation and falling off phenomena, the strength met the requirements, and the high and low temperature tank was reliable, which confirmed processing of projectile base using micro-arc oxidation could resist the instantaneous high temperature erosion effect of gunpowder gas, without affecting the tactical and technical index requirements of shrapnel. Conclusion Processing of projectile base using micro-arc oxidation met the quality requirements of the product, and it could be used in mass production.