Abstract: Electric valve regulation requires fast response speed，high precision control，no overshoot and

strong anti-interference performance. An active disturbance rejection algorithm based on feedforward compensation was used to control the brushless DC motor（BLDC），and the position error was taken as the input of the system.The nonlinear extended state observer was used to observe the total disturbance of the system，and the disturbance was fed forward compensation to reduce the influence of the disturbance on the system，so the traditional active disturbance rejection algorithm was optimized，and the response speed，control accuracy and anti-interference ability of the system were improved. Theoretical analysis，simulation and experimental results show that the improved active disturbance rejection controller（ADRC）improves the response speed and control precision of the system，and the position response speed is improved by 2.73% compared with the traditional ADRC algorithm. At the same time，compared with PID control，the position response speed is improved by 7.76%，and the position control accuracy and disturbance rejection ability are improved obviously.

      Key words: electric valve；feedforward compensation；brushless DCmotor（BLDC）；improved active disturbance rejection