Abstract: The active disturbance rejection control strategy that based on genetic algorithm is proposed for the control system of controllable excitation linear magnetic levitation synchronous motor. According to the operating mechanism of the controllable excitation linear magnetic levitation synchronous motor, established the mathematical model. Designed the feedback tracking differentiator and the extended state observer and the nonlinear feedback control law, besides improved the traditional function fal, applied to the controller. Realized the tracking of the given signal also observe the system coupling amount and external disturbance signal to the "total disturbance" of the system meanwhile observe the it and give compensation. For the problem exist many parameters in the controller which are difficult to be set, using the genetic algorithm to optimize the controller parameters. Established simulation of the control system, the results show that the active disturbance rejection control system based on genetic algorithm has good tracking performance for reference signals and the well suppress ability for disturbance signals.