Due to the roll,pitch,yaw disturbance,the shipborne photoelectric servo device has a great influence on the system steady sate and dynamic accuracy.To improve the target remote tracking accuracy on the sea surface,the CA model least square method is used together with ship-to-earth coordinate transformation filtering,and the velocity is fed forward to the velocity loop of double closed-loop servo control system.The position loop and velocity loop adopt first-order or second-order lag-lead series correction adjuster,based on different tracking states.The first-order and second-order adjuster can be switched into another one in the program,so as to achieve a good tracking effect.Finally,a 19-bit high-precision rotary transformer is added to form a complete double closed-loop servo control system for improving the tracking accuracy.In a test,a certain ship-borne photoelectric servo device performed target remote tracking with medium wave infrared tracking mode.The result shows that: 1) The maximum miss distance is 35″;and 2) The composite angle value of rotary transformer feedback is in agreement with the actual angle value of target measured by radar,and the maximum tracking error is only 100″,which is far less than the tracking accuracy of 4′ required in engineering.