The present high temperature melting incinerator under development at home and abroad is being developed in eco-friendly way to hold back the secondary pollutants, but there are some problems in the economic view on facilities and operating. So in this study, using the high temperature melting incinerator in 30kg/hr class, the experiments to deduce the basic factors to develop the more economical high temperature melting incinerator and was carried out. And we have analyzed the characteristics concerning slag composition that is a by-product of melting.