Abstract Net control system simulation is an important method in the process of research of networked control theory. In the paper, a simulation platform for CANbus control system based on the node task is built. TrueTime software is adopted to design the node, and the task is programmed by Matlab. The platform is more similar to the real control process compared to other methods. At the end, some simulation experiments about the net control in CANbus Protocol are carried out to explain the influence of the data transmission on the control system.