The hydraulic system is the most core component of a cable mounted crane that combines traction and roller walking. This article analyzes the main functions of the cable mounted crane and studies the hydraulic system that meets the various performance indicators of the cable mounted crane. Through in-depth research on hydraulic principles, actuator configuration, component selection, etc., the cable mounted crane can achieve the functions of walking on the cable and positioning lifting. The research results indicate that the maximum walking speed on the cable can reach over 35m/h, the maximum lifting speed can reach over 30m/h, and the precise positioning function can be achieved