As a hydrogen sulfide acid gas treatment unit, the environmental protection significance of Claus sulfur recovery unit in dealing with hydrogen sulfide gas and reducing flue gas emission index is far greater than the economic significance of its production of sulfur products，whether it can run stably for a long period affects the economic benefits of enterprises to a certain extent. In recent years, some optimization measures of how to prolong the operation cycle of Claus sulfur recovery unit in Tianxi Coal to Oil Branch of Shanxi Jincheng Anthracite Mining Group were studied and discussed, including transformation of ignition burner, acid gas proportion regulation, transformation of desalted water preheater, installation of pressure measuring points in liquid sulfur catcher and transformation of tail gas pipeline etc..