Utilization of the municipal wastes became very important matter to be solved for the environmental protection and recycling of waste materials. The ash is collected in Ⅰ incineration plant. The main components of the ash are CaO, SiO2, Al2O3. Remove chloride ion effectively increasing possible archaism liquid ratio before do melting. It is suitable that washing at 20℃/30min lest friedel′s salt should not occur. Did melting for 1 ~ 3 hour in 1,400℃ to decide proper melting time. Result XRD analysis that detention time and glass vitreous executed rationalization is very less. The lowest melting temperature is 1,250℃ at basicity 1.2 by DTA analysis and high temperature microscope analysis. Basicity does 0.6 to 1.4 increases, viscosity becomes low. Pouring index by basicity change experiment result head of a pouring index good basicity appeared by 1.4 in experiment result similarly in basicity 1.4 the lowest point value get can.