Abstract: The medium and low H₂S-bearing natural gas desulfurization technologies at present mainly include dry desulfurization, chelated iron process and biological desulphurization (being developed). Compared with the conventional process flow (i.e. alcohol-amine desulfurization, Claus sulfur recovery and tail gas treatment), these technologies have advantages such as high purification degree, relatively lower energy consumption, relatively lower investment, and environment-friendly, etc., and have been widely applied to desulfurization of natural gas produced from remote scattered gas wells, standard treatment sour gas from amine units and tail gas from Claus units, and other processes.