Abstract: Traditionally,it is assumed for calculating standard pressure in static expansion method that gas is expand ed under isothermal condition.But that condition is rarely encountered in practice.It deduced the way to do the temperature corrections in calculating calibra tion pressure when considering the gas temperature change.Calibration experiments were performed by using a 133.3 Pa full -scale ACDG.The results show that when the most temperature change of calibr ation vessel was 0.05℃the most variation of calibration curves was 0.16%before and after the temperature correcti ons.