High-speed railway motor train unit maintenance plan optimization method and system

The invention relates to a high-speed railway motor train unit maintenance plan optimization method and system. The method comprises the steps: depicting the topological relation among all maintenancetasks in the daily maintenance of a motor train unit, and taking the initial located road section of each motor train unit, each maintenance line of a maintenance base, a daily crossing section in aplanning period, and a standby crossing section as nodes; establishing staying continuing arcs and overhauling continuing arcs meeting continuing conditions among all the nodes according to the topological relation among all the overhauling tasks, and obtaining an overhauling continuing network for motor train unit application; based on the overhauling continuing network for motor train unit application, taking the minimum motor train unit application number and the minimum motor train unit total under-overhauling mileage as targets, and establishing a motor train unit maintenance plan optimization model; finally, solv