Abstract: From the perspective of coke oven maintenance，this paper discusses the causes and control measures for the excessive emission of NMHC from coke oven flue gas. A series of source control measures are introduced，which can effectively reduce the emission of NMHC in coke oven flue gas. The common problems in coke oven maintenance are pointed out，which is beneficial to cokemaking corporates to cut unnecessary investment，diversify maintenance means and improve management level.

Key words: Coke oven, NMHC（Non-methane hydrocarbons）, Coke oven hot repair, Leakage treatment