Abstract: Frequent manual adjustment is needed for the marshalling station stage plan, aiming at this problem, this article drew lessons from the game theory, took collaborative optimization with station shunting locomotive and wagonflow allocation, established collaborative optimization model for the shunting locomotive application and wagonflow allocation. Based on the application of SAM system in Xiangtang West Marshalling Yard in Nanchang Railway Administration, the article designed a scheme of automatic formation and adjustment system of stage plan in marshalling station, implemented by software simulation. The simulation results show that the system can automatically adjust and optimize the stage plan that needs to be adjusted manually. The correctness and effectiveness of the system are verified.