The　Stepwise　Heating　Method　was　tried　to　apply　to　measure　the　thermal　conductivity　of　the　MgO-C　bricks．The thermal conductivity of the MgO-C bricks was also measured by the stationary state method in order to compare to　the　Stepwise　Heating　Method．The　themal　conductivity　of the　MgO-C　bricks　containing 20％-graphite　and 7％-graphite measured by the Stepwise Heating Method almost corresponded to that by the stationary state method．The thermal conductivity of both parallel and vertical direction to the oriented plane of flake graphite was measured　for　the　MgO-C　brick　containing20％-graphite．The　thermal　conductivity　of　parallel　direction　to　the oriented　plane　of　flake　graphite　was　about　1.3-1.5 times　larger　than　that　of　vertical　direction　in　all　the temperatures．The　Stepwise　Heating　Method　cleared　the　influence　of　oriented　plane　of　flake　graphite　on　the thermal　conductivity．In　the　measurement　of　the　thermal　conductivity　of　the　MgO-C　bricks，therefore，the Stepwise Heating Method was considered to more useful than the hot wire method． As a result，the Stepwise Heating　Method　enabled　to　measure　the　thermal　conductivity　of the　MgO-C　bricks　up　to　about 1100K．

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