Low carbon MgO-C specimens with dimension of 36 mm×36 mm were prepared using fused magnesia, flake graphite and carbon black as main starting materials, thermoplastic phenolic resin as binder, hexamethylene tetramine as curing agent, Si powder (w(Si)＞80%, particle size <0.074 mm) and B4C (d90=36.5 μm) as antioxidant, pressing under 200 MPa and drying at 200 ℃ for 24 h. The oxidation resistance tests were conducted at 600 ℃, 1 000 ℃ and 1 400 ℃ for 2 h, respectively. Effects of B4C and Si antioxidant on oxidation resistance of low carbon MgO-C brick were studied by comparing the areas of the decarburized layers. The results show that: (1) When Si powder addition is 3%, at 600 ℃ and 1 000 ℃, the specimens with 0.5% B4C perform good oxidation resistance; at 1 400 ℃, the oxidation resistance of the specimens is improved with the addition of B4C increasing, and that of the specimen with 0.7% B4C is the best. (2) When B4C addition is 0.5%, at 600 ℃ and 1 000 ℃, the oxidation resistances of the specimens with 3% and 5% Si powder are similar, which are better than that of the specimen with 1% Si powder; and at 1 400 ℃, the oxidation resistance of the specimens is improved obviously with the addition of Si powder increasing, and that of the specimen with 5% Si powder is the best. (3) Based on the results, it is believed that the low carbon MgO-C brick with 0.5% B4C and 3% Si powder performs the best oxidation resistance.