Abstract: Fiber membrane technology has been applied to sweetening process of liquefied petroleum gas in Sinopec Yangzi Petrochemical Company. In operation process, the problems that bisulfide separator and the exhaust pipeline corroded, atmosphere pollution caused by the direct exhausting of sweetening tail gas, and the difficult treatment of alkali residue have been found. To solve these issues, improvements and conutermeasures have been proposed. The results showed that improving the adding method of fresh caustic and catalyst can reduce the amount of alkali residue; controlling bisulfide separator under the proper operation temperature and spraying ceramic coatings can avoid the corrosion of separator, replacing material of pipeline can avoid the corrosion of tail gas pipeline; the problem of atmosphere pollution can be solved by sending sweetening tail gas to incinerator of sulfur recovery unit to burn.