Due to the electrohydraulic servo testing machine has strong timevarying and nonlinearity, and load characteristics often change, the system has great parameter uncertainty.When the parameters of the controlled system change,it is difficult to obtain satisfactory control effect by using the traditional PID control with fixed parameters. If the parameters are adjusted again, the complexity of the control operation will be greatly increased.In order to solve this problem, the design scheme of the controller with quantitative feedback theory (QFT) was used to control the electrohydraulic servo testing machine. QFT controller is designed for system uncertainty.For the system with strong control uncertainty, the controller has unique advantages; the QFT controller can also “tailor” the control performance of the system in different frequency bands. The electrohydraulic servo testing machine with parameter uncertainty was identified, and QFT controller design and simulation were carried out on the system model. The results show that the designed QFT controller has higher control precision and stronger robustness than the PID controller when the working condition is changed.