Abstract: Anti oxidation coating technology is one of the most effective ways to solve the high temperature oxidation resistance of carbon/carbon composites. In order to improve the high temperature oxidation resistance of materials above 1 800℃, a SiC/MoSi₂/ZrO₂ gradient oxidation resistant coating system was fabricated on surface of the carbon/carbon composites by the pack cementation method, slurry method and plasma spraying process. The surface and section morphologies of coating were observed by XRD/EDS, intensity and roughness testing. The total coating system is tested by plasma wind tunnel. Results show that the coating has a compact interfacial bonding strength among matrix, transition layer and high temperature oxidation resistance layer. High temperature oxidation resistance layer has uniform thickness and dense structure. After 600 s plasma wind tunnel oxidation, surface temperature of coating reaches up to 1 850℃. The oxidation mass loss rate is 3.15×10^-6 g/(cm²·s). The SiC/MoSi₂/ZrO₂ gradient oxidation resistant coating system has good antioxidant capacity over 1 800℃.