The　reaction　between　magnesia　and　carbon　was　experimentally　investigated　as　a　simplified　simulation of　the　reaction　in　magnesia－carbon　bricks．From　the　results　and　thermodynamic　consideration，the reaction　was　found　to　be　controlled　mostly　by　mass　transport　in　the　gas　phase，depending　on　atmosphere．Etch　pits　were　observed　on　the　reaction　surface　of　magnesia　which　show　the　effect　of　 a　second　phase　such　as　silicate　inclusions　related　to　etch　pits　formation，and　residual　lattice　strain　 in　magnesia　accelerated　the　reaction．

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