The development trend of the aero-engine control system is the distributed control system (DCS), and the communication among devices is the key point and difficult point of DCS. In this article, the communication interface of CAN (Controller Area Network) bus is designed, the CAN communication technology among nodes is studied, the semi-physical platform of DCS is established, and the semi-physical simulation is implemented by combining with the engine model, and the experiment result shows that the control system simulation platform can completely satisfy the requirements of aero-engine DCS.