Abstract: Converted workload is an important tool for urban rail transit operation enterprises to optimize production personnel allocation under FAO (fully automatic operation) mode. By referring to Nanning Rail Transit Line 5 project experience, the application of converted workload to enhance workload estimation accuracy of conventional job posts is studied. By establishing workload calculation system for new inter-disciplinary job posts, refined workload estimation of each post and optimization of personnel allocation standard are carried out, achiev-ing the goal of fewer people, higher efficiency, and full engagement, thus adapting to the urban rail transit operation enterprises' requirements of efficiency improvement, cost reduction, sustainable development under FAO mode.