In response to the Ministry of Ecology and Environmental Protection's ultra-low emission for the steel industry, the operation practice of ultra-low emission of sintered flue gas two-stage activated carbon method in Shanxi is introduced. The principle and system composition of two-stage activated carbon flue gas purification are introduced. The condensation of feed conveyor, the blockage of dust removal pipeline, the leakage dust of the top of feed conveyor, the normal running of adsorption analysis system during acid system out of service for a short time, reducing consumption of activated carbon, the increased pressure drop and poor gas permeability of adsorption tower, the accumulation of activated carbon in air chamber of adsorption tower are analyzed in this paper. Improvement and optimization measures have been proposed. Practice has proven that the concentration of SO₂? after treatment is 0～5mg/Nm³ , and the SO₂? removal rate is 99.7%～100% ; The treated NO_x? concentration is 25～32 mg/Nm³ , and the NOx? removal rate is 85.4%～89.3% ; The concentration of processed dust is 2～10 mg/Nm³ ; The ammonia escape concentration is 2～8 mg/Nm³ , and all indicators are better than the ultra-low emission indicators.