Oxidation　test　using　an　air　atmosphere　electric　furnace　which　is　usually　used　for　gaseous　phase　oxidation　test　was　made　verification．In　this　test，maximum　error　of　weight　loss　by　oxidation　of　carbon　reached　30　percent　when　a　space　of　samples　was　30mm，It　is　inferred　that　a　main　cause　of　the　error　is　distribution　of　oxygen　concentration　in　the　furnace． 　We　introduced　a　bottom　rotating　electric　furnace　to　improve　the　gaseous　phase　oxidation　test　and　tried　it．　As　a　result，error　of　weight　loss　was　less　than　±　1％． 　Measured　values　of　oxidation　rate　agreed　well　with　a　rate　equation　which　was　submitted　by　us，and　it　was　cleared　that　oxidation　rate　of　MgO－C　bricks　was　dominated　by　laminar　film　and　decarbonized　layer．

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