In order to solve the problem that the insufficient load characteristics of the traditional throttle valve throttle speed control loop, the dual speed control valve combination speed mode was explored, and the double throttle combination speed regulating module was designed. Furthermore, the load characteristics of different double throttle valves were calculated theoretically, and the load characteristics of the speed loop were optimized. At the same time, a doublethrottle combination experiment platform was built to test the cylinder speed of any combination of two throttlethrottle areas based on different load, and MATLAB was used to analyze the experimental data, thereby the load characteristic curves of the double throttle valve combination were obtained. It is verified that the experimental load characteristics of the double throttle valve combination are consistent with the theoretical analysis.