Abstract: 【Objective】 In view of 4 type JMS residual film recycling machine in the face of complex topography, especially in the face of soft terrain, uneven terrain without copying function problem, this project aims to design a set of machine-electricity-fluid combined with automatic profiling system, that is the key part for further analysis and field experiment, for the ascension of the performance of the system in the hope of providing certain reference. 【Methods】 In this paper, the structure and working principle of 4JSM-2.1A residual film recovery device were briefly introduced, and the main structure and working principle of the automatic copying system were described. The upper and lower copying movement of the key components of the copying ground wheel was deeply analyzed, and after that, it was found that the copying ground wheel would bounce when working. This phenomenon could be improved by increasing the spring stiffness coefficient and reducing the speed of the machine. Taking the stiffness coefficient of spring, the speed of machine and tools and the difference of ground fluctuation height as the influencing factors, and the qualified rate of soil depth as the experimental index, the orthogonal rotation test with three factors and three levels was carried out. 【Results】 The field test results showed that the order of influencing test indexes was ground height difference, spring stiffness coefficient and machine speed, respectively. Finally, through optimization, the optimal parameter combination was obtained as ground height difference of 20 mm, spring stiffness coefficient of 0.591 N/mm and machine speed of 6 km/h. 【Conclusion】 Under this parameter combination, the qualified rate of penetration depth can reach 93.47%, which is better than the standard value, indicating that the automatic profiling system has a good profiling effect.