Abstract: The hydraulic driving system has been adopted in caterpillar combines because of its simple design, easy to control and flexible steering. This paper analyzes the working processes of hydraulic and mechanical driving systems in caterpillar combines and focuses on the configuration method of the hydraulic driving system, the selection of the hydraulic components, the specification of the hydraulic system, the calculation and testing of the performance of the hydraulic system in some combines. The research results show that this hydraulic driving system is reasonable, feasible and can meet the requirements of combine operation and severe conditions. It provides an important reference for the design and the configuration of hydraulic driving systems in combines in China.