The　corrosion　behaviors　of　chrome　corundum/magnesia　in　laterite　nickel　slag　were　investigated　by　static　crucible　method.　The　results　show　that　the　molten　slag　can　penetrate　into　chrome　corundum　or　magnesia　which　are　used　as　lining　materials　in　smelter　furnace,　and　the　corrosion　can　occur　at　the　slag-refractory　interface　and　the　inner　area　of　the　refractories　as　well.　Both　the　penetrated　amount　of　slag　and　the　penetration　depth　of　Fe,　Si　increase　with　increasing　FeO　content　(10-25　wt%)　in　slag.　Such　penetration　in　magnesia　is　stronger　than　that　in　chrome　corundum　under　the　same　corrosion　conditions,　as　more　pores　in　magnesia　may　provide　channels　for　slag　penetration　and　corrosion　product　transportation.　A　damage　of　the　refractory　linings　and　short　service　life　of　smelter　furnace　may　happen　during　metallurgical　processing　slag　with　high　FeO　content.