Abstract: Using calibration system to measure 1 torr CDG for ambient laboratory temperature between 15.0 ℃ and 26.1 ℃. The calibration also paid attention to the CDG’s zero drifts in the temperature range. In the experiment, we used 690 A 133 Pa CDG as a reference standard. The results showed that in the different ambient laboratory temperatures, all the two CDGs exhibited good linearity. The deviation was proportional to temperature. The zero drift had not a clear relationship with temperature. But more temperature difference there is,bigger zero drift appear.