The application of electric arc furnace for high temperature melting treatment of fly ash was systematically studied from fly ash pretreatment, feeding,high temperature electric arc furnace, slag discharge system, flue gas treatment and so on. The results showed that the pretreatment of fly ash reduced the generation rate of secondary fly ash from 7.5% to 6.1%, and also reduced the content of Cl、S、Na、K、Zn、Pb in the secondary fly ash. Direct water quenching of high temperature slag improved the structure density of melt and energy utilization efficiency. The composite ceramic fiber filter could remove various pollutants in flue gas simultaneously.