The preparation process of alumina-spinel slurries by using micro-sized alumina-spinel mixtures as raw materials was investigated. The slurries with solids content of 62 vol% and viscosity of 0.3 Pa·s were prepared by adding self-made dispersant ANSP which was a mixture of AN-2000 and STP in mass ratio of 4 to 1. The alumina-spinel refractory was fabricated from the slurries by gelcasting process. The dry parts containing micro-sized alumina-spinel powders with 3.57wt% gel have the highest bending strength of 29.8 MPa and 17.6 MPa with 15:1 AM-MBAM and 4:1 MAM-MBAM respectively. The bending strength enhanced with the increase of reaction temperature. For example, to the 15 wt% 15:1 AM-MBAM gel premix, the bending strength of the parts gelled at 25°C and 55°C were 27.3 MPa and 32.4 MPa respectively. The bending strength also increased with the rising of the amount of monomer.