A　two-step　sintering　method　was　used　to　prepare　Al8.31Si1.91Mg3.　78O20(corundum　solid　solution)/Al4.8Si1.2O9.6(mullite　solid　solution)/Mg2.0Al4.　02Si4.98O18(cordierite　solid　solution)　multiphase　material,　for　the　purposes　of　making　these　three　crystal　structures　have　point　defects　which　could　help　the　particles　diffuse　and　transfer　at　high　temperature,　accelerate　the　sintering　efficiently　and　enhance　the　material　strength　as　well　as　the　bulk　density.　The　impacts　of　different　formulas　on　the　structure　and　properties　of　the　multiphase　material　were　investigated.　With　XRD　and　SEM　analyses,　for　each　sample,　the　crystal　structure　and　microstructure　were　characterized,　the　crystalline　phase　content　and　cell　parameters　were　determined　with　Rietveld　Quantification　software,　and　the　properties　were　tested.　The　comparative　optimal　formula　determined　was　calcinated　chamotte　of　80wt%　and　calcinated　sludge　of　20wt%;　and　its　corresponding　bending　strength　and　retention　rate　of　bending　strength　after　a　thermal　shock　were　29.74　MPa　and　80.15%,　respectively.　Copyright　©　2008　Chinese　Journal　of　Structural　Chemistry.