In order to improve the control precision and eliminate the mutual interference effect of flow and pressure in the hydraulic system, the closedloop PID control strategy of flow and pressure was proposed. The difference between the measured value and the set value was inputted PID controller, and the system actual flow and pressure was adjusted by the voltage outputted value of PID controller. The actual flow of the system was adjusted by changing the speed of the AC servo motor. The actual pressure of the system was adjusted by changing the load torque of the magnetic particle brake. The experimental results show that the closedloop control strategy of flow and pressure has good control effect and strong anti disturbance ability.