Abstract: Aiming at the working principle and main functions of Train Control Center (TCC), this paper put forward the overall architecture and communication interface design scheme of TCC simulation subsystem on the basis of CTCS-3 Train Control simulation platform, and implemented the main functions such as track circuit coding, message compilation of active balise, temporary speed limit and signal degradation processing, section changing operation direction, section annunciator lighting, etc. TCC simulation subsystem can display the code sequence change of track section, running direction of section, check the communication message data and simulate the communication fault in real time through two-dimensional visual operation interface, and combined with the 3D TCC cabinet model in the Unity3D development environment, dynamically displays the communication status with other subsystems. The subsystem combines the implementation of logic function with operability and visibility, which has good practical teaching significance.