Abstract: A method for aero-engine electronic control system's CPU board-level collaborative simulation based on Smartmodel is presented. This method is tied in CPU module's characteristic and the project application. The models of 385EX and some peculiar component which are compatible with actual chip's property, and have escalate ability are built. The contravention of intactness and operation efficiency in board-level simulating model is figured out by PCL program, associate with software arithmetic model. The method are discussed from the simulate process of CPU module of aeroengine controller. The simulation results confirm that the method presented is concrete and effective.