Abstract: In order to treat the large number of harmful alkali residue produced in gasoline sweetening process, the three steps of oxidation, carbonization and phenol removal (gasoline extraction, LiFT-CR technique) were successively adopted. The optimal conditions for oxidation, carbonization were studied. The results indicate that by means of adjusting alkali residue oxidation time, oxidation temperature, carbon dioxide flow rate, and the dosage of Na2S and NaSR, the content of active sulfur compounds can be controlled to lower than 100μg/g after oxidation, and the pH value of carbonization waste water can be in between 8.5 and 9.5, resulting in qualified extraction gasoline. The waste water from the sweetening process reaches the requirement of sewage treatment plant.