Cam Mechanism is wide used in many high accuracy movement systems because of its excellent characteristics. This paper introduces the modeling method of electromechanical system with cam mechanism and the designs of simulation program based on discrete method. The model considers most of the nonlinear characteristics

such as the changing load torque

the changing moment of inertia and the transaction clearance between the cam and the slave mechanism. It can be used in the studying of control strategy of the electromechanical systems with cam mechanism. The simulating results convince that the model given is correct.