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The main steam temperature and reheated steam temperature directly affect the thermal efficiency of the thermal power plant and the safety of the steam turbine and other equipment. The control law of the traditional PID controller is simple, but it can not be adjusted according to the uncertainty in the control process. When the parameters of the controlled object change in real time, the controller parameters can not be adjusted in real time. This will lead to the deterioration of the quality of the process. A PID control strategy based on Internal Model Control (IMC) is proposed for superheated steam temperature and reheat steam temperature. PID control, Smith predictive control, deterministic and linear two times optimal feedback control and multiple predictive control are summed up under the same structure. PID-IMC controller design for overheated air temperature and reheat temperature under rated load and 80% rated load is carried out in 1000MW power plant.