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To increase the oxidation resistance of carbon/carbon (C/C) composites at high temperature, it was modified by ZrB 2 –SiC ceramics with precursor infiltration and pyrolysis process, then SiC coating was prepared on the modified composites by pack cementation. The results show that the SiC coating prepared with Si/C weight ratio of 6:0.5 has better oxidation resistance, It can effectively protect C/C composites for 100 h at 1773 K with the weight gain per unit area of 7.75 g cm −2 . The good oxidation resistance of the coated composites is attributed to the formation of dense SiO 2 glass during the oxidation test. [ABSTRACT FROM AUTHOR]