With increasingly strict requirements in environmental protection, the Clinsulf-DO sulfur recovery technology currently used by Jingbian natural Gas Purification Plant cannot meet waste gas emission requirements. Due to such characteristics as low sulfur and high C0₂ content of sour gas from Jingbian Gas Field, conventional Claus desulfurization technology cannot meet relative technological requirements. In combination with the characteristics of sour gas from Jingbian Gas Field, conducted is comprehensive and comparative analysis on domestic oxidation desulphurization technology, complexing iron liquid phase oxidation desulfurization technology. Shell-Paques biological desulfurization technology, WSA arid production and sour gas reinjection technology along with considering local environment and sources, by-product sales, technology advancement , comprehensive benefits of equipment and localization promotion and it is finally decided that the complexing iron liquid phase oxidation technology is applied for sour gas treatment in the new built gas purification plant 4.In order to improve sulfur quality and make the product easy to be sold, purification unit is equipped for crude molten sulfur produced from the complexing iron oxidation process and the sulfur after purification can meet relative quality requirements.