Abstract: The sulfur recovery unit of Puguang gas field was designed by loading imported sulfur recovery catalyst. During the third round overhaul of the device in 2018, domestic catalysts were loaded into the first and second reactors and achieved good results in industrial application. As the bed temperature increased, the hydrolysis activity of organic sulfur enhanced, and the risk of catalyst sulfation reduced. The plant has been running smoothly for one year. The temperature distribution of catalyst bed was uniform and the pressure difference of the system was stable. The catalyst was calibrated twice after running for 5 months and 1 year. The one-way sulfur recovery rate was over 96%, the hydrolysis rate of COS was over 95%, and the hydrolysis rate of CS₂ was up to 100%. The overall operation effect of the unit reached the level of imported catalysts.