condensing steam turbine nozzle adjustment adjusting the level of the enthalpy drop, in the first adjustment steam regulating valve fully open, the second adjustment maximum steam valve is not open, the flow of steam flowing at that time of the first nozzle group reaches the maximum. Since the steam bucket impact, when enthalpy drop is proportional to the steam flow, the stress of rotor blade adjustment is maximum. Then this is the dangerous working condition of adjustable nozzle condensing steam turbine governing stage.