The　corrosion　behavior　of　alumina-chromia　refractory　against　two　kinds　of　industrial　slags　(coal　slag　and　iron　smelting　slag)　at　1550A　degrees　C　was　investigated　via　thermodynamic　simulations.　In　the　proposed　simulation　model,　the　initial　slag　first　attacks　the　matrix　and　surface　aggregates　and　subsequently　attacks　the　inner　aggregates.　The　simulation　results　indicate　that　the　slag　chemistry　strongly　affects　the　phase　formation　and　corrosion　behavior　of　the　refractory　brick.　Greater　amounts　of　alumina　were　dissolved　and　spinel　solid　phases　formed　when　the　brick　interacted　with　iron　smelting　slag.　These　phenomena,　as　well　as　the　calculated　lower　viscosity,　may　lead　to　much　deeper　penetration　than　that　exhibited　by　coal　slag　and　to　more　severe　corrosion　compared　to　that　induced　by　coal　slag.　The　thermodynamic　calculations　well　match　the　experimental　observations,　demonstrating　the　efficiency　of　the　proposed　simulation　model　for　evaluating　the　corrosion　behavior　of　alumina-chromia　refractory.