The　effects　of　temperature　and　oxygen　on　the　wettability　of　alumina　substrates　by liquid　iron　were　measured　at　the temperature　range　from 1823 K　to 2023 K　over　the　wide　range　of　oxygen　concentration　up　to 0.08 mass% by　use　of　the sessile　drop　method．Obtained　results　are　as　follows； （1）　Contact　angle　of　hquid　iron　on　alumina　substrate　decreases　with　increasing　oxygen　concentration　in　liquid　iron，but　does　not　change　with　temperature． （2）　Work　of　adhesion　between　liquid　iron　and　alumina　substrate　decreases　with　increasing　oxygen　concentration，but　does　not　change　with　temperature． （3）　Above　0.04 mass％of　oxygen　concentration　in　liquid　iron，contact　angle　and　work　of　adhesion　are　kept　to　be　nearly constant　and　hercynite （FeO・Al2O3） was　identified　at　the　interface　between　liquid　iron　and　alumina　substrate　by　X－ray method．It　was　estimated　from　work　of　adhesion　and　interfacial　excess　quantity　for　oxygen　that　oxygen　ion　existed　at the　interface　with　close-packing．

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