In steel pipe factory,there is the appearance of a  large area of flame  on the roof of heating furnace during production,mostly in the longitudinal and horizontal expansion joints,and individually around some anchor bricks.The above phenomenon is particularly serious in the soaking zone of the furnace roof,which can bring about serious impact on the safe operation and normal production.This paper studies and analyzes the flame of the heating furnace roof,finds the causes and formulates the corrective and preventive measures,and obtains good results.