For the electro-hydraulic position servo system with active disturbance rejection control strategy,too high system order could lead to many variables to be observed by the state observer,phase lag of the observed information and system response lag and overshoot,a high gain active disturbance rejection control scheme was adopted.The system model order was reduced to simplify the controller structure and reduce the parameters to be adjusted.On the basis of the traditional extended state observer,the differential signal of the total disturbance of the system was further observed to observe the change trend of the system disturbance and generate effective advance compensation signal,so as to improve the control performance and disturbance rejection ability of the system.Finally,the co-simulation was performed by MATLAB and AMESim.The results show that compared with the traditional active disturbance rejection control,the overshoot of the system is reduced by 85%,the response speed is increased by 47.7%,and the anti-interference ability of the system is effectively improved,which has better dynamic and steady performance.