Abstract: The success of the trapezoidal directed valve tray used in the northwest Sichuan desulphurization plant, whose operation of equipments, processing capacity and tray pressure drawdown and so on are better than F₁ floating valve tray, has improved the device stability and economic benefits. As the Zhongba Thunder Third gas reservoir is in the later stage of exploitation, the amount of raw material gas has been near the lower limitation of the device after adaptive improvements, the purification plant operation is becoming more and more difficult. In order to provide a reference for the factory's follow-up production control, this paper also focuses on the calculation and analysis of the absorption column and regeneration column's hydrodynamics and load performance curves.