Abstract: Five extended Claus sulfur recovery processes including CBA, MCRC, SuperClaus, Clinsulf-SDP and CPS applied in sulfur recovery units of PetroChina Southwest Oil & Gasfield Company are minutely analyzed. Based on the comprehensive comparison of the process, energy consumption, problems after commissioning, difficulty level and adaptability of the operation, the results showed that each of them has its own specialty, and can reach the design value of sulfur yield as well as successful operation. CPS has the advantages of CBA and MCRC, and can make the best use of flue gas waste heat for lowering energy consumption. SuperClaus is a stable process which has stable sulfur yield and does not request imported key equipments, it also has the advantage of less problems after putting into operation. As the Clinsulf-SDP is a kind of isothermal reaction, the Claus reaction could be more completely. However, it also has the disadvantages of high requirements for the equipment performance and inconvenience of replacing the catalyst.