By adding fine Fe2O3 powder, the effect of the Fe2O3 addition on the properties of sintering and hydration resistance of MgOCaO refractories was investigated. The results showed that the sintering property of the MgOCaO refractories could be promoted dramatically, and the hydration of the MgOCaO refractories could be inhibited. When increasing the Fe2O3 amount from 0 to 3%, the bulk density of the MgOCaO refractories increased first and then decreased, the apparent porosity gained a sharp decrease and then increased by contraries. They both had extreme values when the Fe2O3 addition was 1%. The bulk density and apparent porosity changed obviously when the Fe2O3 addition was between 0.2% and 0.5%. The chalked ratio of the MgOCaO samples added with 1% Fe2O3 was only 1.46% when hydrated at 60 ℃ (relative moisture 75%) for 144 h.