Drift of sensor heating electrode in practical application is analyzed. The mechanism of the drift is that there are unstable factors such as stress

crystal defect and particle eutectic in the printed and sintered heating electrode

which is in a thermodynamic unstable state. Aiming at the failure mechanism

the aging measures of overload working temperature of heating electrode and the improvement of heating circuit are put forward

and the effectiveness of the measure is verified by experiments. After overload test on 8 test samples

2 unstable products are eliminated and 6 samples entered a relatively stable period. The improved heating circuit is used

the outputs of 6 samples are stable after 4 months of continuous electrification. The experimental results show that the over-load aging of heating electrodes and the improvement of heating circuit are effective

which can reduce the drift of heating electrodes.