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In order to improve oxidation resistance and ther-mal shock resistance of Al2O3- C refractories, two groups of .specimens were prepared with phenolic resin as binder, adding 0, 2 wt% , 4 wt% and 6 wt% commer-cial SiC or ZrO2-SiC composite powder synthesized from zircon respectively to Al2O3- C refractories, press-ing at 200 MPa, drying fully at 250 ℃C , and then car-bon embedded firing at 1 400 ℃ for 2 h. Oxidation re-sistance and thermal shock resistance were researched, phase composition was analyzed by XRD. The results showed that the oxidation of SiC in additives could pro-tect carbon in specimens effectively and thus decreased the mass loss ratio and oxidation area, and improved the oxidation resistance of the specimen. Thermal shock resistance was improved owing to the micro crack tough-ening of ZrO2 and grain toughening of SiC. In this ex-periment, the ,specimens with 6 wt% ZrO2 -SiC com-posite powder or 6 wt% SiC powder had the best oxida-tion resistance and thermal shock resistance.