Oxidation　of　carbon－containing　refractories　such　as　MgO－C　refractories　is　considered　to　be　accelerated　by　open pore　under　condition　in　which　temperature　changes．This　reasoning　was　supported　theoretically　in　this　study．In　this view point，it　is　important　to lower open porosity formed in initial stage of operation so as to decrease wear by oxidation．Therefore，in　this　paper　influences　of　heating-rate，kind　of　binders　and　addition　of　metals　on　formation　of　open　pore　were　investigated，and　the　following　fact　became　evident．　In　order　to　lower　open　porosity，it　is　useful　to　reduce　heating-rate，to　use　resin　binder　with　a　lage　amount　of　carbonization　and　to　add　metals．

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