The mullitization of andalusite from Xinjiang, China and influence of aggregates on properties of aluminosilicate refractories were studied by XRD, SEM, EDS, DSC. It was found that mullitization was obvious at 1 400? ℃, but considerable at 1 500 ℃. The refractories with corundum aggregates had the highest RUL and the lowest creep rate, but refractories with bauxite aggregates had the lowest RUL and the highest creep rate.