Abstract: In order to improve the isolation effect and stability accuracy of shipborne two-dimensional stable platform, the control effects of speed feedforward proportional-integral (PI) controller and linear active disturbance rejection controller are compared. First, on the basis of the mathematical model of two-dimensional stable platform servo system, PI controller and linear active disturbance rejection controller based on ship rocking speed feedforward are designed, and simulation model is established in the simulation software. Then, using actual ship rocking motion data as the excitation input control model, the stability accuracy of the pitch frame of conventional PI control, speed feedforward PI control, and linear active disturbance rejection control is analyzed. Simulation results show that the stability accuracy of linear active disturbance rejection control is significantly better than that of speed feedforward PI control. Finally, it is verified through offshore experiments that the two-dimensional stable platform based on linear active disturbance rejection control has high stability accuracy and can meet the engineering application and performance requirements of the stable platform servo system.