[en] In order to analyze the melting characteristics of non-combustible waste by a plasma torch, the molten status of melting material, the amount and composition of fly ash, the volatility of Cs and Co in the melting process, and the leaching characteristics of the slag was investigated by varying the amount of waste and the melting time. From the study, the more melting time after the complete melting of the bath. Especially the composition of Na and Ca in fly ash increased also. Cs volatility was much higher than Co volatility. The leaching test results with the slags showed to satisfy the EPA reaching standard