Abstract:The reaction of converting process and the structure features of flash converting furnace were introducd briefly, the reasons for the choice of slag type and its features as well as the calcium-ferrite slag affections to the security of the liner of the furnace and the furnace itself were illuminated, the requirement of materials chiefly matte powder feeder to flash converting furance were analysed, and it was also emphasized that the security regulation of furnace is the key of daily regulations of the flash converting furance.