Taking the minimum acceleration of the linear motor as the ultimate goal, the parameters of the mechanical structure as the optimization object, the value range of the design variables and the differential equation of the electromechanical dynamics model as the constraint conditions, the electromechanical coupling dynamics optimization model was established by using particle swarm optimization algorithm.The optimized electromechanical dynamics model is correct and reasonable, which provides the theoretical basis for better control of the rollforming system.