To　define　the　effects　of　metal　added　on　MgO－C　brick　properties，behavior　of　metal　added　in　Graphite－Metal　and　Graphite－Metal－MgO　systems　heated　in　each　atmosphere　of　Ar　and　CO　was　studied．Aｌ，Aｌ－Mg　alloy，and　Ca－Si－Mg　alloy　were　applied． 　　　In　Ar　atmosphere，constituent　Al　and　Si　increasingly　formed　Aｌ4C3　and　SiC　with　elevating　temperatures，and　Mg　and　Ca　were　easy　to　vapor　without　change　of　crystal　phases．Canstituent　Mg　in　Ca－Si－Mg　alloy　had　a　tendency　harder　to　vapor　compared　to　it　in　Al－Mg　alloy． 　　In　CO　atmosphere　supposing　same　condition　as　inside　of　MgO－C　brick，Si　changed　to　SiC　with　elevating　temperatures．　Al　started　to　form　Al4C3　at　lower　temperatures，and　at　higher　temperatures　Al2O3　coexisted　with　its　carbide．　It　should　be　presumed　that　Al　finally　led　to　oxide，AIlO3．On　the　other　hand，Mg　and　Ca　directly　formed　MgO　and　CaO． 　　To　improve　the　decarbonizing－resistant　property　of　brick，constituent　Al，Si，Mg　and　Ca　were　effective　as　reducing　agent　for　CO．Furthermore，Al　and　Si　constructed　the　tight　structure　by　their　volume　expansion　at　forming　new　crystal　phases．Mg　and　Ca　built　up　the　dense　layer　at　hot　face． 　　Effect　of　metal　on　the　strength　property　of　brick　remarkably　appeared　after　the　searting　metal　began　to　form　new　crystal　phases．

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