Abstract: In order to achieve the SO_2 emission being no more than 50 mg/m~3 in coke oven gas according to the " GB 16171—2012" standard in coking chemical industry,Shanxi Coking Group Limited company updated and reconstructed the desulfurization system from 2014 to2015.The vertical space was considered adequately used for shortening the process,because of the limit of place and adjacent to benzene unit.The PDS tower desulfurization technology was adopted during technical reforming.The technology had the advantages of short process,small footprint,less investment,etc. Results show that the H_2S concentration in coke oven gas can be reduced to less than 20 mg/m~3,which can completely meet the requirements of national environmental protection.