1. Impact of combustion on steam temperature. The changing of working condition inside the boiler , which will directly affect the changing of absorption heat share of each heating surface. As the above mentioned, the changing of burners when they are put into use or stopped, the changing of fuel quality and properties, the changing of excess  air coefficient, the air distribution mode and the change of the center of the fire. 

2. The impact of load change on steam temperature. The thermal properties of superheater and reheater determine the impact of load change on steam temperature. If the heating surface has convection characteristics, the steam temperature will rise with the boiler load  rising accordingly. 

3. Impact of the steam pressure change on steam temperature. 

4. Impact of the feed water temperature and attemperation water amount on steam temperature.

5. Impact of exhaust steam temperature of high pressure cylinder on reheating steam temperature.