Abstract: Based on the CTCS-3 train control system, this paper studied the train operation dispatching and control process of high-speed railway, and designed the decentralized and autonomous Centralized Traffic Control(CTC) simulation system, completed the design of system architecture and network communication interface, and implemented the information interaction with Radio Block Center(RBC), Computer Based Interlocking(CBI),Train Control Center(TCC) and other simulation systems. The paper also designed the simulation functions of the system, such as train operation plan release, route automatic control, equipment remote monitoring, temporary speed limit release and cancellation.The simulation results were displayed with route control and temporary speed limit setting as examples.CTC simulation system provides train operation command function for train control simulation system, which has certain practical value for teaching and training related to railway dispatching.