Abstract: In the H-type platform servo system driven by permanent magnet linear synchronous motor, a synchronous control strategy based on coupling parameter identification algorithm and feedback linearization decoupling controller was proposed to overcome the influence of mechanical coupling on system synchronous control performance. Firstly, the mathematical model of synchronous motion system with mechanical coupling dynamics was established. Secondly, a novel coupled parameter identification structure based on disturbance observer was designed. The input excitation adopted relatively smooth sinusoidal position and velocity signals to avoid damage to the mechanical structure. Then, the feedback linearization method was used to decouple the coupled synchronous control system, and the integrated sliding mode controller was designed for the linear subsystem to improve the robustness of the system. Finally, the experimental results show that the proposed identification method can accurately identify the coupling parameters of the system, and the feedback linearized sliding mode controller based on the identification parameters can effectively eliminate the influence of mechanical coupling and improve the performance of synchronous control.