Abstract: There were some problems in S Zorb gasoline refining unit of Yan’an Petrochemical Factory in operation, such as low yield of stabilized gasoline, mismatch of heat removal system of the regenerator and catalyst regeneration. By optimizing the operating parameters of stabilization system, the emission of fuel gas from stabilization tower is reduced and the yield of gasoline is improved by 0.7%. The modifications of revamping the regenerator heat removal system and adding N2 heat removal system effectively protect the regenerator heat removal coil and reduce operation difficulty. Then the hot nitrogen is used as a heat source for fresh N2. The purpose of saving consumption and energy is achieved.