The paper analyzed technical emphasis and problems of load throw-off for the 600MW subcritical precritical and supercritical steam turbine
and the OPC control
unit rotational speed control
bypass control
boiler control
high-pressure exhaust temperature control
boiler and turbine exhausting pressure method and auxiliary equipments control are presented in detail.The risks of load throw-off is decreased and the mission success rate is increased by using corresponding countermeasures.