To improve the anti-disturbance ability and synchronous motion performance of the H-platforms dual linear motor motion control system,a dual loop cross-coupled sliding mode synchronous control method with position and speed bias was proposed.The cross-coupled algorithm was used to establish the bias (tracking error) coupling relationship of dual linear motors and output the synchronous error.Combining the sliding mode control algorithm,the simultaneous convergence of tracking error and synchronization error was realized.Based on the simulation experiments,the position tracking performance and synchronous control performance of cross-coupled sliding mode control methods with single position loop,single speed loop and position-speed dual loop after disturbance input were compared and analyzed.The simulation results show that the motor position tracking performance and synchronous control performance of position-speed dual loop control method are improved by 60.6%/85.0% and 51.95%/41.91%,respectively,compared with single position loop control method and single speed loop control method.The result provides a reference for the synchronization control application of motion platform.