Abstract: By analyzing the effects of fuel mass flow disturbance, feedwater mass flow disturbance and turbine control valve's opening disturbance on dynamic response of main steam pressure and separator outlet temperature of a supercritical power unit, corresponding dynamic characteristics and couplings of relative process variables are obtained. Based on theoretical analysis of the correlation among fuel demand, feedwater demand and fuel-water ratio, the dynamic and static relations between unit demand and boiler demand are put forward. The concept of integrated steam-water control is proposed for the supercritical power unit, of which the control strategy is optimized by adopting the variable setpoint, variable parameter and dynamic feed-forward control mode, so as to make the unit response follow AGC requirements steadily and rapidly, and subsequently guarantee stable operation of the supercritical power unit under variable parameters.