Abstract: Considering the nonlinear distribution characteristics of water level control for steam generator in nuclear power plants, a novel control strategy is proposed in combination of active disturbance rejection technology with multimodel-based control, in which a multimodel-based control system is designed for the steam generator, and an independent active disturbance rejection controller is prepared for each model under different loading conditions, so as to realize online estimation at extended states, and achieve prompt disturbance elimination by independent disturbance compensation. Simulation results show that the control strategy can help to realize accurate dynamic control for water level of steam generator, which is featured by strong robustness, high disturbance rejection capability, simple computation and facile commissioning.