In the process of the operation of the high-speed large-stroke circular slide system, the circular orbit curve and the rail paragraphs connection issue causes series of questions, like the operation process of load truck is unstable, the response rate is not fast, and the positioning error of the terminal position is large, and so on. A set of double-track mechanical sliding structure was designed, which could effectively improve the stability of the truck. As the aspect of the control system, the position loop adopted feedforward control, to improve the accuracy of motor control system combined with PID control. The mathematical model of the circular slide platform was established, a simulation model based on feedforward control in MATLAB simulation environment was established, and the experimental platform was built according to the simulation model. The results of the simulation experiment showed that, without feedforward control, the range of tracking error was[-0.4 0.4] mm, and the range of tracking error was[-0.18 0.18] mm after the introduction of feedforward control. It could be calculated and concluded that after the introduction of feedforward control, the tracking accuracy of the system was increased by 1.2 times and the response rate of the system was increased by 16.7%. It was shown that under the condition of feedforward control the theoretical position error of the truck could maintain at[0.2 0.2] mm by the experimental results and the actual position error of the truck was 0.69 mm. Both errors were less than 1 mm which was the design required, and the system had a fast response speed. The research results provide effective reference data for the mechanical design scheme and performance testing process of the sliding rail system. At the same time, the results will promote the industrial automation of the rail system test.