Abstract: The question that ammonium salt block-up and corrosion in trays and air cooler for the debutanization column of continuous catalytic reforming unit is analyzed, which occurs during the long-term operation of Zhenhai Refining & Chemical Company's continuous catalytic reforming unit. According to the water-soluble property of chlorination ammonium salt, in practical production we use the method water injection cleaning before air cooler for the debutanization column and during charge-in to avoid ammonium salt's deposition, and achieved good practical results, ensure long-term operation of the device.