Abstract: According to the characteristics of discrete logic jump and continuous time behavior in the inter city railway train control system, this article adopted the combination of Simulink and Stateflow in Matlab to model and simulate the hybrid behavior of train control system, analyze the emergency braking distance of the train and train running curve at different speeds after the train exceeded the emergency braking trigger speed. The results showed that the emergency braking distance generated by model met the requirements of CRH EMU manufacturer, had a certain safety margin. The modeling method is simple and efficient, the model can better describe the characteristics of the system. The simulation results can provide data support for designing and implementation of the on-board system.