Active disturbance rejection control (ADRC) is a very popular algorithm used in many industrial plants owing to its capability of anti-uncertainties. However, there exists the steady-state error caused by the effect of actuator saturation. In this paper to overcome this issue, an anti-saturation strategy named integral-linear ADRC (I-LADRC) is proposed. A parameter tuning method for I-LADRC is also presented to achive good performance. Comparing with PID and LADRC algorithms, the proposed method achieved an excellent performance which is validated by the 300MW thermal power plant.