SiC coating for protecting graphite materials against oxidation was prepared using SiC, Si and thermosetting phenolic resin as materials by vapor silicon infiltration process(VSI). SEM and XRD showed that a dense SiC coating was obtained with a C/SiC gradient inner layer acting as bonding layer and combined well with the outlayer SiC coating , the main phases of coating consisted of α-SiC, β-SiC and Si, and free Si was residual after the VSI process. The as-obtained SiC coating can effectively protect graphite after oxidation for 16 h at 1200 ℃ with a weight gain about 2.18 mg/cm₂ in air and endured the thermal shock between 1000℃ and room temperature for 15 cycles with only 0.17wt% weight loss.