Abstract: In order to shorten the waiting time of taking subway and alleviate the pressure of crowd, the Six-Sigma management DMAIC improving methodologies are applied, by means of definition, measurement, analysis and improvement process, through a field investigation and analysis of the current operation of the metro system. Emphasizing constructing control charts and sequence plots, the reasons for the excessively long waiting time, which lie within and outside the metro system, are deduced. Combined with IE methods, a systematic reform plan is presented comprising the ticketing system improvement, visual control layout management and flexible service. Simulation software is used to verify the effect. The study has proved that the reform plan has a 21% improvement on shortening waiting time, increasing service stability, raising worker utilization and balancing each workers’ load.