In order to solve the metering demand of the large range force value instrument, a set of double pump hydraulic control system with a range of 20 MN was studied. In the hydraulic system, the combination of large flow low pressure pump and small flow high pressure pump was controlled by the servo motor to achieve high pressure and large flow output, and the feedback signal of the standard dynamometer was introduced into the system to form a control closed loop. The results show that the system has fast response speed, high control precision, and can provide stable and effective force.