Abstract: The design of Φ25 m rotary heating furnace,which uses mixed blast furnace gas and coke-oven gas its fuel,in such aspects as its middle diameter determination,furnace lining design,heating distribution and smoke exhausting is introduced and the measured data of its heating system in its early running period are briefly analyzed. The three year's running since the rotary heating furnace put into operation proves the overall design of the furnace is reasonable with its running in good condition and its targets all meeting requirements.