Abstract: In view of the characteristics of short-term passenger flow peak and significant reduction of passenger flow in off-season in China's railway passenger transportation, this paper developed a real time display system of flexible marshalling EMU network display screen, which could display a variety of marshalling forms in real time, solved the problem of manually updating the display screen software or manual configuration after the marshalling form changes. This system can be applied in the rail transit industry to improve the intelligent level of EMU or metro vehicles and reduce the cost of manual operation and maintenance.